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DAB VS 65/150 M Bronze Wet-Rotor Circulator – Potable Hot Water Pump, 6m Head, 3.7 m³/h, 77W, 150mm, 1½" BSP
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DAB VS 65/150 M Bronze Wet-Rotor Circulator – Potable Hot Water Pump, 6m Head, 3.7 m³/h, 77W, 150mm, 1½" BSP

DAB VS 65/150 M Bronze Wet-Rotor Circulator – Potable Hot Water Pump, 6m Head, 3.7 m³/h, 77W, 150mm, 1½" BSP

Bronze Pump BodyPotable Hot Water77 W Max Input6 m Max Head3.7 m³/h Max Flow150 mm Centre Distance1½" BSP Connections10 Bar Working Pressure85°C Sanitary / 110°C MaxIP44 / Class F InsulationThree-Speed230V / 50Hz

The DAB VS 65/150 M is the highest-output model in the DAB VS series of bronze wet-rotor circulators, purpose-built for the circulation of potable (drinkable) hot water in domestic and residential hot water service (DHWS) systems. The bronze pump body sets it apart from standard cast-iron heating circulators — it is approved for direct contact with drinking water, making it the correct choice for unvented cylinder recirculation loops, thermal store returns and hot water distribution pipework. With a maximum head of 6 metres, maximum flow of 3.7 m³/h and 77W maximum power input, the VS 65/150 M handles larger domestic installations and longer distribution runs where the smaller VS 8, 16 or 35 models fall short. 150mm centre distance, 1½" BSP connections, three-speed operation, IP44 / Class F, and a wet-rotor design that requires no mechanical seal or overload protection complete the specification.

6 m
Max Head
3.7 m³/h
Max Flow Rate
77 W
Max Power Input
10 bar
Working Pressure
85 °C
Max Sanitary Temp
150 mm
Centre Distance
ⓘ Bronze Body — Potable Water Approved: The VS 65/150 M uses a bronze pump body throughout, making it suitable for circulation of drinkable hot water. Standard cast-iron circulators are not suitable for potable water contact. Specify the VS series wherever the pump is in contact with domestic hot water supply.
⚠ Scale Advisory: To avoid calcium build-up, DAB recommends keeping water temperature at or below 65°C in sanitary systems. Where mains water hardness exceeds 15 French degrees (~150 ppm CaCO₃ — common in southern England), a water softening or scale-reduction device should be fitted upstream of the pump.
DAB VS Series — Full Range Comparison
Model Max Flow Max Head (speed 3) Max Power Current Capacitor
VS 8/150 M 0–1.5 m³/h 0.83 m 22 W 0.14 A 1.5 µF
VS 16/150 M 0–3.0 m³/h 1.82 m 41 W 0.19 A 1.5 µF
VS 35/150 M 0–3.0 m³/h 4.10 m 55 W 0.24 A 1.7 µF
VS 65/150 M ✓ 0–5.4 m³/h 6.00 m 77 W 0.34 A 2.0 µF

All models: 150mm centre distance, 1½" BSP, bronze body, 230V/50Hz, IP44, Class F, 10 bar, 2.6 kg. This listing covers the VS 65/150 M — highest-output model in the VS range.

Key Features & Technology
Bronze Pump Body — Approved for Potable Hot Water
The VS series uses a bronze (GCuSn) pump body throughout, making it one of the few wet-rotor circulators formally suitable for circulation of drinkable (potable) hot water in domestic and residential systems. Bronze resists dezincification, is non-reactive with drinking water and meets the material requirements for sanitary water systems. This distinguishes the VS from standard cast-iron heating circulators, which are not suitable for potable water contact.
Highest Head and Flow in the VS Range — 6 m / 3.7 m³/h
The VS 65/150 M is the top-of-range model in the DAB VS series, delivering a maximum head of 6 metres at zero flow and a maximum flow rate of 3.7 m³/h (approximately 61 l/min) at low head. This makes it suitable for larger domestic DHWS installations, longer pipe runs and multi-storey buildings where the lower-output VS 8, 16 or 35 models would be insufficient.
Three-Speed Operation — Matched to System Demand
A three-speed selector allows the pump output to be matched to the actual system requirement, avoiding unnecessary energy use when full performance is not needed. Speed selection is a simple manual switch on the terminal box. At reduced speeds the pump draws less power than the 77W maximum, reducing running costs in systems that spend most of their time at lower loads.
Wet-Rotor Asynchronous Motor — No Mechanical Seal to Fail
The wet-rotor motor design means the rotor runs submerged in the pumped liquid, which also acts as the lubricant for the graphite bushings. There is no shaft seal or gland packing — the single most common failure point on dry-rotor pumps — giving the VS series a characteristically long and low-maintenance service life. The motor shaft can be manually de-blocked in the event of seizure after a long idle period.
Class F Insulation / IP44 Protection
Class F insulation (rated to 155°C winding temperature) gives the motor generous thermal headroom relative to the 85°C maximum liquid temperature for sanitary use, ensuring the motor runs well within its limits in normal operation. IP44 ingress protection guards against solid objects over 1mm and water splashing from any direction — appropriate for a typical plant room or airing cupboard installation.
Flexible Connection Options — 1½" BSP or Compression Fittings
The standard pump connections are 1½" BSP threaded ports (suction and delivery). Additional union connectors are available in ½"F, ¾"F and 1"F thread sizes, and copper pipe welded union connectors for 22mm and 28mm pipe are available as accessories — making the VS 65/150 M compatible with the vast majority of UK domestic pipework configurations without adapters.
Stainless Steel Internal Components — Corrosion Resistance Throughout
Wetted internal components other than the bronze body are specified in corrosion-resistant materials: tempered stainless steel motor shaft, stainless steel rotor liner, stator liner and closing flange, ceramic thrust ring and ethylene-propylene (EPDM) seal rings. The brass vent/air bleed plug allows manual de-aeration at commissioning.
Calcium / Scale Advisory — Observe 65°C Limit for Longevity
DAB specifies that water temperature should not exceed 65°C in sanitary systems to avoid calcium scaling on impeller and internal surfaces. Where mains water hardness exceeds 15 French degrees (approximately 150 ppm CaCO₃ — typical of hard-water areas in southern England), a calcium removal / water softening system should be incorporated upstream of the pump. Following this guidance protects both the pump and the wider DHWS installation.
Technical Specifications — DAB VS 65/150 M (Datasheet VS_TS_ENG)
Performance
Max Head (Speed 3) 6.0 m
Max Flow Rate 3.7 m³/h (62 l/min)
Head at 0.6 m³/h 5.55 m
Head at 1.2 m³/h 5.05 m
Head at 1.8 m³/h 4.25 m
Head at 2.4 m³/h 3.40 m
Head at 3.0 m³/h 2.60 m
Head at 4.2 m³/h 1.80 m
Head at 5.4 m³/h 1.05 m
Curve tolerance ISO 9906
Electrical
Power Supply Single-phase 230V / 50Hz
Max Power Input (P1) 77 W
Nominal Current (In) 0.34 A
Capacitor 2.0 µF
Speed Settings 3-speed manual
Cable Gland PG 11
Hydraulic
Max Working Pressure 10 bar (1000 kPa)
Min Suction Pressure 1.5 m.c.w. (at 90°C)
Liquid Temp Range — Sanitary -10°C to +85°C
Liquid Temp Range — Other Uses -10°C to +110°C
Pumped Liquid Clean potable water, free of solids and mineral oils; glycol max 30%
Connections & Dimensions
Centre Distance (port-to-port) 150 mm
Standard Port Connections 1½" BSP threaded (suction & delivery)
Optional Union Connectors ½"F, ¾"F, 1"F brass; copper Ø22mm, Ø28mm
Body Dimensions (L × B × H) 150 × 104 × 124 mm
Weight 2.6 kg
Installation Orientation Horizontal motor axis only
Construction Materials
Pump Body Bronze
Impeller Technopolymer
Motor Shaft Tempered stainless steel (ceramic)
Rotor Liner / Stator Liner / Closing Flange Stainless steel
Bushings Graphite (lubricated by pumped liquid)
Thrust Ring Ceramic
Seal Rings Ethylene-propylene (EPDM)
Motor Casing Die-cast aluminium
Vent / Air Bleed Plug Brass
Protection & Standards
Ingress Protection IP44
Insulation Class Class F (155°C)
Motor Type Wet-rotor asynchronous two-pole, resistance protected
Overload Protection Required No — resistance protected by design
ℹ Installation Notes: The VS 65/150 M must be installed with the motor axis horizontal — vertical motor-axis installation is not permitted. Ensure the brass air bleed plug is accessible for de-aeration at commissioning. The motor shaft de-blocking screw should be used if the pump has been stationary for an extended period before restarting. Wire to a 3A fused spur; no external overload relay is required. For copper pipe connections, use the optional Ø22mm or Ø28mm welded union connectors.
Frequently Asked Questions
What is the VS 65/150 M used for — is it a heating or hot water pump?
The DAB VS series is specifically designed for the circulation of potable (drinkable) hot water in domestic hot water service (DHWS) systems — for example, recirculation loops on unvented cylinders, thermal store returns or hot water distribution in residential buildings. The bronze pump body is the key distinction: it is approved for contact with drinking water. Standard heating circulators use cast iron bodies and are not suitable for potable water systems.
What is the difference between the VS 35/150 M and VS 65/150 M?
Both models share identical dimensions (150mm centre distance, 1½" BSP, 2.6 kg) and all the same construction features. The difference is performance: the VS 35 delivers a maximum head of 4.1m and consumes up to 55W, while the VS 65 delivers 6m maximum head and 3.7 m³/h maximum flow at 77W. Choose the VS 65 for longer pipe runs, larger systems, or where the VS 35 falls short of the calculated system resistance.
Can I use the VS 65/150 M on a heating system instead of a hot water system?
Yes — DAB lists the VS series for both hot sanitary water and heating/air conditioning applications. When used in a non-sanitary (heating) circuit, the maximum liquid temperature extends to +110°C rather than the +85°C sanitary limit. However, for pure heating duty a standard cast-iron circulator (such as the DAB VA or Grundfos UPS range) is usually more cost-effective. The bronze body of the VS is its distinguishing feature for potable water contact.
What connections does the VS 65/150 M use and what pipe sizes are compatible?
The standard ports are 1½" BSP threaded. Union connectors are available in ½"F, ¾"F and 1"F, and copper welded union connectors for 22mm and 28mm pipe are available as accessories — the most common domestic pipe sizes in the UK. The 150mm centre distance (port-to-port) is the standard dimension compatible with most residential DHWS cylinder pump sets and valve packs.
Does the VS 65/150 M require overload protection?
No. The wet-rotor asynchronous motor is resistance-protected by design and does not require external overload protection — unlike externally-ventilated dry-rotor pumps, which typically need a motor protection relay. Standard single-phase wiring to a fused spur (typically 3A fuse) is all that is required. The motor shaft can be manually de-blocked via the de-blocking screw if the pump has been stationary for an extended period.
Related Products
DAB VS 35/150 M
Bronze sanitary circulator — 4.1m head, 55W
DAB VS 16/150 M
Bronze sanitary circulator — 1.82m head, 41W
Intatec Heat Pump Ball Valve
Isolation & balancing for DHWS and heat pump circuits
$92.12

Original: $263.19

-65%
DAB VS 65/150 M Bronze Wet-Rotor Circulator – Potable Hot Water Pump, 6m Head, 3.7 m³/h, 77W, 150mm, 1½" BSP—

$263.19

$92.12

More Images

DAB VS 65/150 M Bronze Wet-Rotor Circulator – Potable Hot Water Pump, 6m Head, 3.7 m³/h, 77W, 150mm, 1½" BSP - Image 2
DAB VS 65/150 M Bronze Wet-Rotor Circulator – Potable Hot Water Pump, 6m Head, 3.7 m³/h, 77W, 150mm, 1½" BSP - Image 3

DAB VS 65/150 M Bronze Wet-Rotor Circulator – Potable Hot Water Pump, 6m Head, 3.7 m³/h, 77W, 150mm, 1½" BSP

Bronze Pump BodyPotable Hot Water77 W Max Input6 m Max Head3.7 m³/h Max Flow150 mm Centre Distance1½" BSP Connections10 Bar Working Pressure85°C Sanitary / 110°C MaxIP44 / Class F InsulationThree-Speed230V / 50Hz

The DAB VS 65/150 M is the highest-output model in the DAB VS series of bronze wet-rotor circulators, purpose-built for the circulation of potable (drinkable) hot water in domestic and residential hot water service (DHWS) systems. The bronze pump body sets it apart from standard cast-iron heating circulators — it is approved for direct contact with drinking water, making it the correct choice for unvented cylinder recirculation loops, thermal store returns and hot water distribution pipework. With a maximum head of 6 metres, maximum flow of 3.7 m³/h and 77W maximum power input, the VS 65/150 M handles larger domestic installations and longer distribution runs where the smaller VS 8, 16 or 35 models fall short. 150mm centre distance, 1½" BSP connections, three-speed operation, IP44 / Class F, and a wet-rotor design that requires no mechanical seal or overload protection complete the specification.

6 m
Max Head
3.7 m³/h
Max Flow Rate
77 W
Max Power Input
10 bar
Working Pressure
85 °C
Max Sanitary Temp
150 mm
Centre Distance
ⓘ Bronze Body — Potable Water Approved: The VS 65/150 M uses a bronze pump body throughout, making it suitable for circulation of drinkable hot water. Standard cast-iron circulators are not suitable for potable water contact. Specify the VS series wherever the pump is in contact with domestic hot water supply.
⚠ Scale Advisory: To avoid calcium build-up, DAB recommends keeping water temperature at or below 65°C in sanitary systems. Where mains water hardness exceeds 15 French degrees (~150 ppm CaCO₃ — common in southern England), a water softening or scale-reduction device should be fitted upstream of the pump.
DAB VS Series — Full Range Comparison
Model Max Flow Max Head (speed 3) Max Power Current Capacitor
VS 8/150 M 0–1.5 m³/h 0.83 m 22 W 0.14 A 1.5 µF
VS 16/150 M 0–3.0 m³/h 1.82 m 41 W 0.19 A 1.5 µF
VS 35/150 M 0–3.0 m³/h 4.10 m 55 W 0.24 A 1.7 µF
VS 65/150 M ✓ 0–5.4 m³/h 6.00 m 77 W 0.34 A 2.0 µF

All models: 150mm centre distance, 1½" BSP, bronze body, 230V/50Hz, IP44, Class F, 10 bar, 2.6 kg. This listing covers the VS 65/150 M — highest-output model in the VS range.

Key Features & Technology
Bronze Pump Body — Approved for Potable Hot Water
The VS series uses a bronze (GCuSn) pump body throughout, making it one of the few wet-rotor circulators formally suitable for circulation of drinkable (potable) hot water in domestic and residential systems. Bronze resists dezincification, is non-reactive with drinking water and meets the material requirements for sanitary water systems. This distinguishes the VS from standard cast-iron heating circulators, which are not suitable for potable water contact.
Highest Head and Flow in the VS Range — 6 m / 3.7 m³/h
The VS 65/150 M is the top-of-range model in the DAB VS series, delivering a maximum head of 6 metres at zero flow and a maximum flow rate of 3.7 m³/h (approximately 61 l/min) at low head. This makes it suitable for larger domestic DHWS installations, longer pipe runs and multi-storey buildings where the lower-output VS 8, 16 or 35 models would be insufficient.
Three-Speed Operation — Matched to System Demand
A three-speed selector allows the pump output to be matched to the actual system requirement, avoiding unnecessary energy use when full performance is not needed. Speed selection is a simple manual switch on the terminal box. At reduced speeds the pump draws less power than the 77W maximum, reducing running costs in systems that spend most of their time at lower loads.
Wet-Rotor Asynchronous Motor — No Mechanical Seal to Fail
The wet-rotor motor design means the rotor runs submerged in the pumped liquid, which also acts as the lubricant for the graphite bushings. There is no shaft seal or gland packing — the single most common failure point on dry-rotor pumps — giving the VS series a characteristically long and low-maintenance service life. The motor shaft can be manually de-blocked in the event of seizure after a long idle period.
Class F Insulation / IP44 Protection
Class F insulation (rated to 155°C winding temperature) gives the motor generous thermal headroom relative to the 85°C maximum liquid temperature for sanitary use, ensuring the motor runs well within its limits in normal operation. IP44 ingress protection guards against solid objects over 1mm and water splashing from any direction — appropriate for a typical plant room or airing cupboard installation.
Flexible Connection Options — 1½" BSP or Compression Fittings
The standard pump connections are 1½" BSP threaded ports (suction and delivery). Additional union connectors are available in ½"F, ¾"F and 1"F thread sizes, and copper pipe welded union connectors for 22mm and 28mm pipe are available as accessories — making the VS 65/150 M compatible with the vast majority of UK domestic pipework configurations without adapters.
Stainless Steel Internal Components — Corrosion Resistance Throughout
Wetted internal components other than the bronze body are specified in corrosion-resistant materials: tempered stainless steel motor shaft, stainless steel rotor liner, stator liner and closing flange, ceramic thrust ring and ethylene-propylene (EPDM) seal rings. The brass vent/air bleed plug allows manual de-aeration at commissioning.
Calcium / Scale Advisory — Observe 65°C Limit for Longevity
DAB specifies that water temperature should not exceed 65°C in sanitary systems to avoid calcium scaling on impeller and internal surfaces. Where mains water hardness exceeds 15 French degrees (approximately 150 ppm CaCO₃ — typical of hard-water areas in southern England), a calcium removal / water softening system should be incorporated upstream of the pump. Following this guidance protects both the pump and the wider DHWS installation.
Technical Specifications — DAB VS 65/150 M (Datasheet VS_TS_ENG)
Performance
Max Head (Speed 3) 6.0 m
Max Flow Rate 3.7 m³/h (62 l/min)
Head at 0.6 m³/h 5.55 m
Head at 1.2 m³/h 5.05 m
Head at 1.8 m³/h 4.25 m
Head at 2.4 m³/h 3.40 m
Head at 3.0 m³/h 2.60 m
Head at 4.2 m³/h 1.80 m
Head at 5.4 m³/h 1.05 m
Curve tolerance ISO 9906
Electrical
Power Supply Single-phase 230V / 50Hz
Max Power Input (P1) 77 W
Nominal Current (In) 0.34 A
Capacitor 2.0 µF
Speed Settings 3-speed manual
Cable Gland PG 11
Hydraulic
Max Working Pressure 10 bar (1000 kPa)
Min Suction Pressure 1.5 m.c.w. (at 90°C)
Liquid Temp Range — Sanitary -10°C to +85°C
Liquid Temp Range — Other Uses -10°C to +110°C
Pumped Liquid Clean potable water, free of solids and mineral oils; glycol max 30%
Connections & Dimensions
Centre Distance (port-to-port) 150 mm
Standard Port Connections 1½" BSP threaded (suction & delivery)
Optional Union Connectors ½"F, ¾"F, 1"F brass; copper Ø22mm, Ø28mm
Body Dimensions (L × B × H) 150 × 104 × 124 mm
Weight 2.6 kg
Installation Orientation Horizontal motor axis only
Construction Materials
Pump Body Bronze
Impeller Technopolymer
Motor Shaft Tempered stainless steel (ceramic)
Rotor Liner / Stator Liner / Closing Flange Stainless steel
Bushings Graphite (lubricated by pumped liquid)
Thrust Ring Ceramic
Seal Rings Ethylene-propylene (EPDM)
Motor Casing Die-cast aluminium
Vent / Air Bleed Plug Brass
Protection & Standards
Ingress Protection IP44
Insulation Class Class F (155°C)
Motor Type Wet-rotor asynchronous two-pole, resistance protected
Overload Protection Required No — resistance protected by design
ℹ Installation Notes: The VS 65/150 M must be installed with the motor axis horizontal — vertical motor-axis installation is not permitted. Ensure the brass air bleed plug is accessible for de-aeration at commissioning. The motor shaft de-blocking screw should be used if the pump has been stationary for an extended period before restarting. Wire to a 3A fused spur; no external overload relay is required. For copper pipe connections, use the optional Ø22mm or Ø28mm welded union connectors.
Frequently Asked Questions
What is the VS 65/150 M used for — is it a heating or hot water pump?
The DAB VS series is specifically designed for the circulation of potable (drinkable) hot water in domestic hot water service (DHWS) systems — for example, recirculation loops on unvented cylinders, thermal store returns or hot water distribution in residential buildings. The bronze pump body is the key distinction: it is approved for contact with drinking water. Standard heating circulators use cast iron bodies and are not suitable for potable water systems.
What is the difference between the VS 35/150 M and VS 65/150 M?
Both models share identical dimensions (150mm centre distance, 1½" BSP, 2.6 kg) and all the same construction features. The difference is performance: the VS 35 delivers a maximum head of 4.1m and consumes up to 55W, while the VS 65 delivers 6m maximum head and 3.7 m³/h maximum flow at 77W. Choose the VS 65 for longer pipe runs, larger systems, or where the VS 35 falls short of the calculated system resistance.
Can I use the VS 65/150 M on a heating system instead of a hot water system?
Yes — DAB lists the VS series for both hot sanitary water and heating/air conditioning applications. When used in a non-sanitary (heating) circuit, the maximum liquid temperature extends to +110°C rather than the +85°C sanitary limit. However, for pure heating duty a standard cast-iron circulator (such as the DAB VA or Grundfos UPS range) is usually more cost-effective. The bronze body of the VS is its distinguishing feature for potable water contact.
What connections does the VS 65/150 M use and what pipe sizes are compatible?
The standard ports are 1½" BSP threaded. Union connectors are available in ½"F, ¾"F and 1"F, and copper welded union connectors for 22mm and 28mm pipe are available as accessories — the most common domestic pipe sizes in the UK. The 150mm centre distance (port-to-port) is the standard dimension compatible with most residential DHWS cylinder pump sets and valve packs.
Does the VS 65/150 M require overload protection?
No. The wet-rotor asynchronous motor is resistance-protected by design and does not require external overload protection — unlike externally-ventilated dry-rotor pumps, which typically need a motor protection relay. Standard single-phase wiring to a fused spur (typically 3A fuse) is all that is required. The motor shaft can be manually de-blocked via the de-blocking screw if the pump has been stationary for an extended period.
Related Products
DAB VS 35/150 M
Bronze sanitary circulator — 4.1m head, 55W
DAB VS 16/150 M
Bronze sanitary circulator — 1.82m head, 41W
Intatec Heat Pump Ball Valve
Isolation & balancing for DHWS and heat pump circuits

Product Information

Shipping & Returns

Description

Bronze Pump BodyPotable Hot Water77 W Max Input6 m Max Head3.7 m³/h Max Flow150 mm Centre Distance1½" BSP Connections10 Bar Working Pressure85°C Sanitary / 110°C MaxIP44 / Class F InsulationThree-Speed230V / 50Hz

The DAB VS 65/150 M is the highest-output model in the DAB VS series of bronze wet-rotor circulators, purpose-built for the circulation of potable (drinkable) hot water in domestic and residential hot water service (DHWS) systems. The bronze pump body sets it apart from standard cast-iron heating circulators — it is approved for direct contact with drinking water, making it the correct choice for unvented cylinder recirculation loops, thermal store returns and hot water distribution pipework. With a maximum head of 6 metres, maximum flow of 3.7 m³/h and 77W maximum power input, the VS 65/150 M handles larger domestic installations and longer distribution runs where the smaller VS 8, 16 or 35 models fall short. 150mm centre distance, 1½" BSP connections, three-speed operation, IP44 / Class F, and a wet-rotor design that requires no mechanical seal or overload protection complete the specification.

6 m
Max Head
3.7 m³/h
Max Flow Rate
77 W
Max Power Input
10 bar
Working Pressure
85 °C
Max Sanitary Temp
150 mm
Centre Distance
ⓘ Bronze Body — Potable Water Approved: The VS 65/150 M uses a bronze pump body throughout, making it suitable for circulation of drinkable hot water. Standard cast-iron circulators are not suitable for potable water contact. Specify the VS series wherever the pump is in contact with domestic hot water supply.
⚠ Scale Advisory: To avoid calcium build-up, DAB recommends keeping water temperature at or below 65°C in sanitary systems. Where mains water hardness exceeds 15 French degrees (~150 ppm CaCO₃ — common in southern England), a water softening or scale-reduction device should be fitted upstream of the pump.
DAB VS Series — Full Range Comparison
Model Max Flow Max Head (speed 3) Max Power Current Capacitor
VS 8/150 M 0–1.5 m³/h 0.83 m 22 W 0.14 A 1.5 µF
VS 16/150 M 0–3.0 m³/h 1.82 m 41 W 0.19 A 1.5 µF
VS 35/150 M 0–3.0 m³/h 4.10 m 55 W 0.24 A 1.7 µF
VS 65/150 M ✓ 0–5.4 m³/h 6.00 m 77 W 0.34 A 2.0 µF

All models: 150mm centre distance, 1½" BSP, bronze body, 230V/50Hz, IP44, Class F, 10 bar, 2.6 kg. This listing covers the VS 65/150 M — highest-output model in the VS range.

Key Features & Technology
Bronze Pump Body — Approved for Potable Hot Water
The VS series uses a bronze (GCuSn) pump body throughout, making it one of the few wet-rotor circulators formally suitable for circulation of drinkable (potable) hot water in domestic and residential systems. Bronze resists dezincification, is non-reactive with drinking water and meets the material requirements for sanitary water systems. This distinguishes the VS from standard cast-iron heating circulators, which are not suitable for potable water contact.
Highest Head and Flow in the VS Range — 6 m / 3.7 m³/h
The VS 65/150 M is the top-of-range model in the DAB VS series, delivering a maximum head of 6 metres at zero flow and a maximum flow rate of 3.7 m³/h (approximately 61 l/min) at low head. This makes it suitable for larger domestic DHWS installations, longer pipe runs and multi-storey buildings where the lower-output VS 8, 16 or 35 models would be insufficient.
Three-Speed Operation — Matched to System Demand
A three-speed selector allows the pump output to be matched to the actual system requirement, avoiding unnecessary energy use when full performance is not needed. Speed selection is a simple manual switch on the terminal box. At reduced speeds the pump draws less power than the 77W maximum, reducing running costs in systems that spend most of their time at lower loads.
Wet-Rotor Asynchronous Motor — No Mechanical Seal to Fail
The wet-rotor motor design means the rotor runs submerged in the pumped liquid, which also acts as the lubricant for the graphite bushings. There is no shaft seal or gland packing — the single most common failure point on dry-rotor pumps — giving the VS series a characteristically long and low-maintenance service life. The motor shaft can be manually de-blocked in the event of seizure after a long idle period.
Class F Insulation / IP44 Protection
Class F insulation (rated to 155°C winding temperature) gives the motor generous thermal headroom relative to the 85°C maximum liquid temperature for sanitary use, ensuring the motor runs well within its limits in normal operation. IP44 ingress protection guards against solid objects over 1mm and water splashing from any direction — appropriate for a typical plant room or airing cupboard installation.
Flexible Connection Options — 1½" BSP or Compression Fittings
The standard pump connections are 1½" BSP threaded ports (suction and delivery). Additional union connectors are available in ½"F, ¾"F and 1"F thread sizes, and copper pipe welded union connectors for 22mm and 28mm pipe are available as accessories — making the VS 65/150 M compatible with the vast majority of UK domestic pipework configurations without adapters.
Stainless Steel Internal Components — Corrosion Resistance Throughout
Wetted internal components other than the bronze body are specified in corrosion-resistant materials: tempered stainless steel motor shaft, stainless steel rotor liner, stator liner and closing flange, ceramic thrust ring and ethylene-propylene (EPDM) seal rings. The brass vent/air bleed plug allows manual de-aeration at commissioning.
Calcium / Scale Advisory — Observe 65°C Limit for Longevity
DAB specifies that water temperature should not exceed 65°C in sanitary systems to avoid calcium scaling on impeller and internal surfaces. Where mains water hardness exceeds 15 French degrees (approximately 150 ppm CaCO₃ — typical of hard-water areas in southern England), a calcium removal / water softening system should be incorporated upstream of the pump. Following this guidance protects both the pump and the wider DHWS installation.
Technical Specifications — DAB VS 65/150 M (Datasheet VS_TS_ENG)
Performance
Max Head (Speed 3) 6.0 m
Max Flow Rate 3.7 m³/h (62 l/min)
Head at 0.6 m³/h 5.55 m
Head at 1.2 m³/h 5.05 m
Head at 1.8 m³/h 4.25 m
Head at 2.4 m³/h 3.40 m
Head at 3.0 m³/h 2.60 m
Head at 4.2 m³/h 1.80 m
Head at 5.4 m³/h 1.05 m
Curve tolerance ISO 9906
Electrical
Power Supply Single-phase 230V / 50Hz
Max Power Input (P1) 77 W
Nominal Current (In) 0.34 A
Capacitor 2.0 µF
Speed Settings 3-speed manual
Cable Gland PG 11
Hydraulic
Max Working Pressure 10 bar (1000 kPa)
Min Suction Pressure 1.5 m.c.w. (at 90°C)
Liquid Temp Range — Sanitary -10°C to +85°C
Liquid Temp Range — Other Uses -10°C to +110°C
Pumped Liquid Clean potable water, free of solids and mineral oils; glycol max 30%
Connections & Dimensions
Centre Distance (port-to-port) 150 mm
Standard Port Connections 1½" BSP threaded (suction & delivery)
Optional Union Connectors ½"F, ¾"F, 1"F brass; copper Ø22mm, Ø28mm
Body Dimensions (L × B × H) 150 × 104 × 124 mm
Weight 2.6 kg
Installation Orientation Horizontal motor axis only
Construction Materials
Pump Body Bronze
Impeller Technopolymer
Motor Shaft Tempered stainless steel (ceramic)
Rotor Liner / Stator Liner / Closing Flange Stainless steel
Bushings Graphite (lubricated by pumped liquid)
Thrust Ring Ceramic
Seal Rings Ethylene-propylene (EPDM)
Motor Casing Die-cast aluminium
Vent / Air Bleed Plug Brass
Protection & Standards
Ingress Protection IP44
Insulation Class Class F (155°C)
Motor Type Wet-rotor asynchronous two-pole, resistance protected
Overload Protection Required No — resistance protected by design
ℹ Installation Notes: The VS 65/150 M must be installed with the motor axis horizontal — vertical motor-axis installation is not permitted. Ensure the brass air bleed plug is accessible for de-aeration at commissioning. The motor shaft de-blocking screw should be used if the pump has been stationary for an extended period before restarting. Wire to a 3A fused spur; no external overload relay is required. For copper pipe connections, use the optional Ø22mm or Ø28mm welded union connectors.
Frequently Asked Questions
What is the VS 65/150 M used for — is it a heating or hot water pump?
The DAB VS series is specifically designed for the circulation of potable (drinkable) hot water in domestic hot water service (DHWS) systems — for example, recirculation loops on unvented cylinders, thermal store returns or hot water distribution in residential buildings. The bronze pump body is the key distinction: it is approved for contact with drinking water. Standard heating circulators use cast iron bodies and are not suitable for potable water systems.
What is the difference between the VS 35/150 M and VS 65/150 M?
Both models share identical dimensions (150mm centre distance, 1½" BSP, 2.6 kg) and all the same construction features. The difference is performance: the VS 35 delivers a maximum head of 4.1m and consumes up to 55W, while the VS 65 delivers 6m maximum head and 3.7 m³/h maximum flow at 77W. Choose the VS 65 for longer pipe runs, larger systems, or where the VS 35 falls short of the calculated system resistance.
Can I use the VS 65/150 M on a heating system instead of a hot water system?
Yes — DAB lists the VS series for both hot sanitary water and heating/air conditioning applications. When used in a non-sanitary (heating) circuit, the maximum liquid temperature extends to +110°C rather than the +85°C sanitary limit. However, for pure heating duty a standard cast-iron circulator (such as the DAB VA or Grundfos UPS range) is usually more cost-effective. The bronze body of the VS is its distinguishing feature for potable water contact.
What connections does the VS 65/150 M use and what pipe sizes are compatible?
The standard ports are 1½" BSP threaded. Union connectors are available in ½"F, ¾"F and 1"F, and copper welded union connectors for 22mm and 28mm pipe are available as accessories — the most common domestic pipe sizes in the UK. The 150mm centre distance (port-to-port) is the standard dimension compatible with most residential DHWS cylinder pump sets and valve packs.
Does the VS 65/150 M require overload protection?
No. The wet-rotor asynchronous motor is resistance-protected by design and does not require external overload protection — unlike externally-ventilated dry-rotor pumps, which typically need a motor protection relay. Standard single-phase wiring to a fused spur (typically 3A fuse) is all that is required. The motor shaft can be manually de-blocked via the de-blocking screw if the pump has been stationary for an extended period.
Related Products
DAB VS 35/150 M
Bronze sanitary circulator — 4.1m head, 55W
DAB VS 16/150 M
Bronze sanitary circulator — 1.82m head, 41W
Intatec Heat Pump Ball Valve
Isolation & balancing for DHWS and heat pump circuits