OSO AquaSustain DHP 200L Integrated Heat Pump Cylinder | MEV | R290 | A+ | G3 Kit Included
OSO AquaSustain DHP 200L Integrated Heat Pump Cylinder — 200L stainless steel cylinder with integrated air-source heat pump | R290 refrigerant (GWP 3, ODP 0) | Energy Class A+ | COP up to 3.16 | Up to 60°C (heat pump) · 70°C (with 1,500W heater) | ~6h 12m heat-up (ECO mode) | MEV-compatible | G3 kit included | Ambient -10°C to 40°C | NCM (SAP) ID: 108965
The AquaSustain DHP is classified as an Exhaust Air MEV Heat Pump. Instead of drawing fresh outside air directly, it can extract warm, moist and stale air from kitchens, bathrooms and utility rooms — recycling the heat from that air into domestic hot water. This simultaneously ventilates the property and heats water, making it especially well suited to new-build homes and retrofit projects where whole-home ventilation is required.
The OSO AquaSustain DHP 200L is a fully self-contained, integrated heat pump water heater — combining a 200-litre stainless steel unvented cylinder in the lower section with an air-source heat pump unit in the upper section, all in a single compact floor-standing unit. There is no need for a separate outdoor unit, separate cylinder, or additional buffer tank.
Using R290 natural refrigerant (150g charge, GWP 3), the AquaSustain delivers a COP of up to 3.16 — producing over three times as much heat energy as it consumes in electricity. It can heat water to 60°C using the heat pump alone, with a 1,500W titanium electric backup element capable of reaching 70°C for anti-Legionella or high-demand top-up. The unit is designed for continuous, low-rate operation — heating the tank steadily over several hours rather than in short bursts — which keeps the COP consistently high and running costs low.
The AquaSustain ships complete with a full G3 unvented kit (expansion vessel, inlet group, T&P valve, tundish), anti-vibration feet, condensate drain fitting, and two 160mm duct adaptors. It is listed on the Government's Product Characteristics Database (NCM SAP ID: 108965) as an Exhaust Air MEV heat pump, making it eligible for compliance pathways under Part L Building Regulations.
Key Features
Recovery & Heat-Up Times
Heat-up time is measured from a cold start in ECO mode (heat pump only), per EN16147. The AquaSustain is designed to heat continuously over an extended period — it should remain powered at all times unless the property will be unoccupied for more than 24 hours.
| Mode & Conditions | 200L DHP |
|---|---|
| ECO mode — heat pump only (full heat-up from cold) | ~6h 12m (372 min) |
| Boost mode — 1,500W electric element + heat pump (2,000W total) | Significantly faster — recommended for top-up or urgent demand |
| Continuous hot water output — heat pump heating power range | 1,005–1,750W heating power |
| Annual electricity consumption (average climate, load profile L) | 830 kWh/year |
| Annual electricity consumption (cold climate) | 1,094 kWh/year |
| Standby heat loss | 1.57 kWh/24h (67W) |
💡 Tip: The AquaSustain's ~6h 12m ECO heat-up time fits comfortably within a standard Economy 7 or off-peak tariff window. Schedule via the touch controller to run during your cheapest rate period. For households on Octopus Go or similar smart tariffs, PV mode can further reduce running costs by using free solar export energy for top-up heating during the day.
Technical Specifications
| Specification | Detail |
|---|---|
| Brand / Range | OSO Hotwater / AquaSustain DHP |
| Model | AquaSustain DHP 200 |
| NCM (SAP) Identifier | 108965 |
| Tank Capacity | 200L |
| Tank Construction | Stainless steel (ULTRAWELD) |
| Tank Warranty | 10 years |
| Refrigerant / Charge | R290 / 150g — GWP 3, ODP 0 |
| Energy Efficiency Class | A+ |
| Load Profile (EN16147) | L |
| COP (average climate) | 2.95 |
| COP (warm climate) | 3.16 |
| Water Heating Energy Efficiency (average climate) | 133% |
| Heat Pump Heating Power Range | 1,005–1,750W |
| Heat Pump Power Input Range | 405–500W |
| Auxiliary Electric Heater | 1,500W titanium element |
| Max Combined Power Input | 2,000W |
| Max Temperature (heat pump only) | 60°C |
| Max Temperature (with electric heater) | 70°C |
| DHW Temperature Range | 35–60°C (HP) · up to 70°C (with element) |
| Default Temperature (ECO / AUTO) | 55°C / 60°C |
| Heat-Up Time ECO Mode (cold start) | ~6h 12m (372 min) |
| Standby Heat Loss | 1.57 kWh/24h (67W) |
| Annual Electricity Consumption (cold climate) | 1,094 kWh/year |
| Annual Electricity Consumption (average climate) | 830 kWh/year |
| Annual Electricity Consumption (warm climate) | 772 kWh/year |
| Ambient Temperature Range | -10°C to 40°C |
| Sound Power | 53 dB(A) |
| Sound Pressure @2m (high speed) | 45.9 dB(A) |
| Sound Pressure @2m (low speed) | 41 dB(A) |
| Air Connection Diameter | 150 / 160 / 200mm (2× 160mm adaptors supplied) |
| Min Air Flow (external supply) | 215 m³/h |
| Min Air Flow (internal / MEV supply) | 190 m³/h |
| Max Air Flow Rate (speed 3) | 438 m³/h |
| Power Supply | 230V / 1ph / 50Hz |
| Max Operating Pressure | 6 bar |
| Water Inlet / Outlet Connection | ¾" F |
| T&P Safety Valve Connection | ½" F |
| Heat Exchanger Area | 0.39 m² |
| Dimensions (W × D × H) | 584 × 624 × 1,540mm |
| Net Weight (empty) | 80 kg |
| Weight (full) | 280 kg |
| Packaged Weight | 87.5 kg |
What's Included
In the Box — G3 Kit & Accessories Supplied
AquaSustain unit with touch controller, insulation and anti-vibration feet.
G3 Unvented Kit: Expansion vessel · 3 bar inlet pressure reducer · 6 bar safety valve · ½" T&P valve · Ø15mm × Ø22mm tundish.
Also included: Condensate drain fitting · Drainage nozzle · 2× 160mm duct adaptors · User manual.
Ducting, additional fittings and commissioning by a G3-qualified engineer are required and not included.
Frequently Asked Questions
In ECO mode (heat pump only), the 200L tank heats from cold in approximately 6 hours 12 minutes (372 minutes). The unit is designed for continuous low-rate operation — it should remain switched on at all times for normal use. Activating Boost mode (heat pump + 1,500W electric element, 2,000W combined) provides significantly faster heat-up for urgent demand or top-up situations.
MEV stands for Mechanical Extract Ventilation. The AquaSustain is classified as an Exhaust Air MEV heat pump — it can extract warm, moist and stale air from kitchens, bathrooms and utility rooms via ductwork, recovering that heat into hot water while simultaneously ventilating the property. This makes it particularly well suited to new-build homes where whole-house MEV is required under Part F Building Regulations. It can also operate in fresh-air mode, drawing directly from outside.
Yes. The AquaSustain DHP 200 ships with a complete G3 unvented safety kit: expansion vessel, 3 bar inlet pressure reducing valve, 6 bar safety valve, ½" T&P relief valve, and tundish. Anti-vibration feet, condensate drain fitting and two 160mm duct adaptors are also included. The installer will need to supply ducting and any additional plumbing fittings to suit the specific installation.
Yes. The unit accepts an external PV signal input — when connected to a compatible solar diverter or export controller, it will switch to heating mode automatically when excess generation is available, using free solar electricity to heat the tank rather than exporting it to the grid.
In many cases, yes — the AquaSustain has a similar footprint to a standard 200L unvented cylinder and includes the G3 safety kit. The main additional requirements are a suitable air duct connection (150/160/200mm) and sufficient space for the unit's height of 1,540mm. Installation must be carried out by a G3-qualified engineer and notified to building control under Part G3.
🔧 Installation Notes
The OSO AquaSustain DHP 200L is a mains-pressure unvented heat pump water heater and must be installed by a G3-qualified engineer in accordance with Building Regulations Part G3, Part F (ventilation) and the manufacturer's installation manual. Key requirements are summarised below.
For full installation instructions, please refer to the manufacturer's installation manual supplied with the unit.
Original: $4,578.08
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OSO AquaSustain DHP 200L Integrated Heat Pump Cylinder | MEV | R290 | A+ | G3 Kit Included
OSO AquaSustain DHP 200L Integrated Heat Pump Cylinder — 200L stainless steel cylinder with integrated air-source heat pump | R290 refrigerant (GWP 3, ODP 0) | Energy Class A+ | COP up to 3.16 | Up to 60°C (heat pump) · 70°C (with 1,500W heater) | ~6h 12m heat-up (ECO mode) | MEV-compatible | G3 kit included | Ambient -10°C to 40°C | NCM (SAP) ID: 108965
The AquaSustain DHP is classified as an Exhaust Air MEV Heat Pump. Instead of drawing fresh outside air directly, it can extract warm, moist and stale air from kitchens, bathrooms and utility rooms — recycling the heat from that air into domestic hot water. This simultaneously ventilates the property and heats water, making it especially well suited to new-build homes and retrofit projects where whole-home ventilation is required.
The OSO AquaSustain DHP 200L is a fully self-contained, integrated heat pump water heater — combining a 200-litre stainless steel unvented cylinder in the lower section with an air-source heat pump unit in the upper section, all in a single compact floor-standing unit. There is no need for a separate outdoor unit, separate cylinder, or additional buffer tank.
Using R290 natural refrigerant (150g charge, GWP 3), the AquaSustain delivers a COP of up to 3.16 — producing over three times as much heat energy as it consumes in electricity. It can heat water to 60°C using the heat pump alone, with a 1,500W titanium electric backup element capable of reaching 70°C for anti-Legionella or high-demand top-up. The unit is designed for continuous, low-rate operation — heating the tank steadily over several hours rather than in short bursts — which keeps the COP consistently high and running costs low.
The AquaSustain ships complete with a full G3 unvented kit (expansion vessel, inlet group, T&P valve, tundish), anti-vibration feet, condensate drain fitting, and two 160mm duct adaptors. It is listed on the Government's Product Characteristics Database (NCM SAP ID: 108965) as an Exhaust Air MEV heat pump, making it eligible for compliance pathways under Part L Building Regulations.
Key Features
Recovery & Heat-Up Times
Heat-up time is measured from a cold start in ECO mode (heat pump only), per EN16147. The AquaSustain is designed to heat continuously over an extended period — it should remain powered at all times unless the property will be unoccupied for more than 24 hours.
| Mode & Conditions | 200L DHP |
|---|---|
| ECO mode — heat pump only (full heat-up from cold) | ~6h 12m (372 min) |
| Boost mode — 1,500W electric element + heat pump (2,000W total) | Significantly faster — recommended for top-up or urgent demand |
| Continuous hot water output — heat pump heating power range | 1,005–1,750W heating power |
| Annual electricity consumption (average climate, load profile L) | 830 kWh/year |
| Annual electricity consumption (cold climate) | 1,094 kWh/year |
| Standby heat loss | 1.57 kWh/24h (67W) |
💡 Tip: The AquaSustain's ~6h 12m ECO heat-up time fits comfortably within a standard Economy 7 or off-peak tariff window. Schedule via the touch controller to run during your cheapest rate period. For households on Octopus Go or similar smart tariffs, PV mode can further reduce running costs by using free solar export energy for top-up heating during the day.
Technical Specifications
| Specification | Detail |
|---|---|
| Brand / Range | OSO Hotwater / AquaSustain DHP |
| Model | AquaSustain DHP 200 |
| NCM (SAP) Identifier | 108965 |
| Tank Capacity | 200L |
| Tank Construction | Stainless steel (ULTRAWELD) |
| Tank Warranty | 10 years |
| Refrigerant / Charge | R290 / 150g — GWP 3, ODP 0 |
| Energy Efficiency Class | A+ |
| Load Profile (EN16147) | L |
| COP (average climate) | 2.95 |
| COP (warm climate) | 3.16 |
| Water Heating Energy Efficiency (average climate) | 133% |
| Heat Pump Heating Power Range | 1,005–1,750W |
| Heat Pump Power Input Range | 405–500W |
| Auxiliary Electric Heater | 1,500W titanium element |
| Max Combined Power Input | 2,000W |
| Max Temperature (heat pump only) | 60°C |
| Max Temperature (with electric heater) | 70°C |
| DHW Temperature Range | 35–60°C (HP) · up to 70°C (with element) |
| Default Temperature (ECO / AUTO) | 55°C / 60°C |
| Heat-Up Time ECO Mode (cold start) | ~6h 12m (372 min) |
| Standby Heat Loss | 1.57 kWh/24h (67W) |
| Annual Electricity Consumption (cold climate) | 1,094 kWh/year |
| Annual Electricity Consumption (average climate) | 830 kWh/year |
| Annual Electricity Consumption (warm climate) | 772 kWh/year |
| Ambient Temperature Range | -10°C to 40°C |
| Sound Power | 53 dB(A) |
| Sound Pressure @2m (high speed) | 45.9 dB(A) |
| Sound Pressure @2m (low speed) | 41 dB(A) |
| Air Connection Diameter | 150 / 160 / 200mm (2× 160mm adaptors supplied) |
| Min Air Flow (external supply) | 215 m³/h |
| Min Air Flow (internal / MEV supply) | 190 m³/h |
| Max Air Flow Rate (speed 3) | 438 m³/h |
| Power Supply | 230V / 1ph / 50Hz |
| Max Operating Pressure | 6 bar |
| Water Inlet / Outlet Connection | ¾" F |
| T&P Safety Valve Connection | ½" F |
| Heat Exchanger Area | 0.39 m² |
| Dimensions (W × D × H) | 584 × 624 × 1,540mm |
| Net Weight (empty) | 80 kg |
| Weight (full) | 280 kg |
| Packaged Weight | 87.5 kg |
What's Included
In the Box — G3 Kit & Accessories Supplied
AquaSustain unit with touch controller, insulation and anti-vibration feet.
G3 Unvented Kit: Expansion vessel · 3 bar inlet pressure reducer · 6 bar safety valve · ½" T&P valve · Ø15mm × Ø22mm tundish.
Also included: Condensate drain fitting · Drainage nozzle · 2× 160mm duct adaptors · User manual.
Ducting, additional fittings and commissioning by a G3-qualified engineer are required and not included.
Frequently Asked Questions
In ECO mode (heat pump only), the 200L tank heats from cold in approximately 6 hours 12 minutes (372 minutes). The unit is designed for continuous low-rate operation — it should remain switched on at all times for normal use. Activating Boost mode (heat pump + 1,500W electric element, 2,000W combined) provides significantly faster heat-up for urgent demand or top-up situations.
MEV stands for Mechanical Extract Ventilation. The AquaSustain is classified as an Exhaust Air MEV heat pump — it can extract warm, moist and stale air from kitchens, bathrooms and utility rooms via ductwork, recovering that heat into hot water while simultaneously ventilating the property. This makes it particularly well suited to new-build homes where whole-house MEV is required under Part F Building Regulations. It can also operate in fresh-air mode, drawing directly from outside.
Yes. The AquaSustain DHP 200 ships with a complete G3 unvented safety kit: expansion vessel, 3 bar inlet pressure reducing valve, 6 bar safety valve, ½" T&P relief valve, and tundish. Anti-vibration feet, condensate drain fitting and two 160mm duct adaptors are also included. The installer will need to supply ducting and any additional plumbing fittings to suit the specific installation.
Yes. The unit accepts an external PV signal input — when connected to a compatible solar diverter or export controller, it will switch to heating mode automatically when excess generation is available, using free solar electricity to heat the tank rather than exporting it to the grid.
In many cases, yes — the AquaSustain has a similar footprint to a standard 200L unvented cylinder and includes the G3 safety kit. The main additional requirements are a suitable air duct connection (150/160/200mm) and sufficient space for the unit's height of 1,540mm. Installation must be carried out by a G3-qualified engineer and notified to building control under Part G3.
🔧 Installation Notes
The OSO AquaSustain DHP 200L is a mains-pressure unvented heat pump water heater and must be installed by a G3-qualified engineer in accordance with Building Regulations Part G3, Part F (ventilation) and the manufacturer's installation manual. Key requirements are summarised below.
For full installation instructions, please refer to the manufacturer's installation manual supplied with the unit.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
OSO AquaSustain DHP 200L Integrated Heat Pump Cylinder — 200L stainless steel cylinder with integrated air-source heat pump | R290 refrigerant (GWP 3, ODP 0) | Energy Class A+ | COP up to 3.16 | Up to 60°C (heat pump) · 70°C (with 1,500W heater) | ~6h 12m heat-up (ECO mode) | MEV-compatible | G3 kit included | Ambient -10°C to 40°C | NCM (SAP) ID: 108965
The AquaSustain DHP is classified as an Exhaust Air MEV Heat Pump. Instead of drawing fresh outside air directly, it can extract warm, moist and stale air from kitchens, bathrooms and utility rooms — recycling the heat from that air into domestic hot water. This simultaneously ventilates the property and heats water, making it especially well suited to new-build homes and retrofit projects where whole-home ventilation is required.
The OSO AquaSustain DHP 200L is a fully self-contained, integrated heat pump water heater — combining a 200-litre stainless steel unvented cylinder in the lower section with an air-source heat pump unit in the upper section, all in a single compact floor-standing unit. There is no need for a separate outdoor unit, separate cylinder, or additional buffer tank.
Using R290 natural refrigerant (150g charge, GWP 3), the AquaSustain delivers a COP of up to 3.16 — producing over three times as much heat energy as it consumes in electricity. It can heat water to 60°C using the heat pump alone, with a 1,500W titanium electric backup element capable of reaching 70°C for anti-Legionella or high-demand top-up. The unit is designed for continuous, low-rate operation — heating the tank steadily over several hours rather than in short bursts — which keeps the COP consistently high and running costs low.
The AquaSustain ships complete with a full G3 unvented kit (expansion vessel, inlet group, T&P valve, tundish), anti-vibration feet, condensate drain fitting, and two 160mm duct adaptors. It is listed on the Government's Product Characteristics Database (NCM SAP ID: 108965) as an Exhaust Air MEV heat pump, making it eligible for compliance pathways under Part L Building Regulations.
Key Features
Recovery & Heat-Up Times
Heat-up time is measured from a cold start in ECO mode (heat pump only), per EN16147. The AquaSustain is designed to heat continuously over an extended period — it should remain powered at all times unless the property will be unoccupied for more than 24 hours.
| Mode & Conditions | 200L DHP |
|---|---|
| ECO mode — heat pump only (full heat-up from cold) | ~6h 12m (372 min) |
| Boost mode — 1,500W electric element + heat pump (2,000W total) | Significantly faster — recommended for top-up or urgent demand |
| Continuous hot water output — heat pump heating power range | 1,005–1,750W heating power |
| Annual electricity consumption (average climate, load profile L) | 830 kWh/year |
| Annual electricity consumption (cold climate) | 1,094 kWh/year |
| Standby heat loss | 1.57 kWh/24h (67W) |
💡 Tip: The AquaSustain's ~6h 12m ECO heat-up time fits comfortably within a standard Economy 7 or off-peak tariff window. Schedule via the touch controller to run during your cheapest rate period. For households on Octopus Go or similar smart tariffs, PV mode can further reduce running costs by using free solar export energy for top-up heating during the day.
Technical Specifications
| Specification | Detail |
|---|---|
| Brand / Range | OSO Hotwater / AquaSustain DHP |
| Model | AquaSustain DHP 200 |
| NCM (SAP) Identifier | 108965 |
| Tank Capacity | 200L |
| Tank Construction | Stainless steel (ULTRAWELD) |
| Tank Warranty | 10 years |
| Refrigerant / Charge | R290 / 150g — GWP 3, ODP 0 |
| Energy Efficiency Class | A+ |
| Load Profile (EN16147) | L |
| COP (average climate) | 2.95 |
| COP (warm climate) | 3.16 |
| Water Heating Energy Efficiency (average climate) | 133% |
| Heat Pump Heating Power Range | 1,005–1,750W |
| Heat Pump Power Input Range | 405–500W |
| Auxiliary Electric Heater | 1,500W titanium element |
| Max Combined Power Input | 2,000W |
| Max Temperature (heat pump only) | 60°C |
| Max Temperature (with electric heater) | 70°C |
| DHW Temperature Range | 35–60°C (HP) · up to 70°C (with element) |
| Default Temperature (ECO / AUTO) | 55°C / 60°C |
| Heat-Up Time ECO Mode (cold start) | ~6h 12m (372 min) |
| Standby Heat Loss | 1.57 kWh/24h (67W) |
| Annual Electricity Consumption (cold climate) | 1,094 kWh/year |
| Annual Electricity Consumption (average climate) | 830 kWh/year |
| Annual Electricity Consumption (warm climate) | 772 kWh/year |
| Ambient Temperature Range | -10°C to 40°C |
| Sound Power | 53 dB(A) |
| Sound Pressure @2m (high speed) | 45.9 dB(A) |
| Sound Pressure @2m (low speed) | 41 dB(A) |
| Air Connection Diameter | 150 / 160 / 200mm (2× 160mm adaptors supplied) |
| Min Air Flow (external supply) | 215 m³/h |
| Min Air Flow (internal / MEV supply) | 190 m³/h |
| Max Air Flow Rate (speed 3) | 438 m³/h |
| Power Supply | 230V / 1ph / 50Hz |
| Max Operating Pressure | 6 bar |
| Water Inlet / Outlet Connection | ¾" F |
| T&P Safety Valve Connection | ½" F |
| Heat Exchanger Area | 0.39 m² |
| Dimensions (W × D × H) | 584 × 624 × 1,540mm |
| Net Weight (empty) | 80 kg |
| Weight (full) | 280 kg |
| Packaged Weight | 87.5 kg |
What's Included
In the Box — G3 Kit & Accessories Supplied
AquaSustain unit with touch controller, insulation and anti-vibration feet.
G3 Unvented Kit: Expansion vessel · 3 bar inlet pressure reducer · 6 bar safety valve · ½" T&P valve · Ø15mm × Ø22mm tundish.
Also included: Condensate drain fitting · Drainage nozzle · 2× 160mm duct adaptors · User manual.
Ducting, additional fittings and commissioning by a G3-qualified engineer are required and not included.
Frequently Asked Questions
In ECO mode (heat pump only), the 200L tank heats from cold in approximately 6 hours 12 minutes (372 minutes). The unit is designed for continuous low-rate operation — it should remain switched on at all times for normal use. Activating Boost mode (heat pump + 1,500W electric element, 2,000W combined) provides significantly faster heat-up for urgent demand or top-up situations.
MEV stands for Mechanical Extract Ventilation. The AquaSustain is classified as an Exhaust Air MEV heat pump — it can extract warm, moist and stale air from kitchens, bathrooms and utility rooms via ductwork, recovering that heat into hot water while simultaneously ventilating the property. This makes it particularly well suited to new-build homes where whole-house MEV is required under Part F Building Regulations. It can also operate in fresh-air mode, drawing directly from outside.
Yes. The AquaSustain DHP 200 ships with a complete G3 unvented safety kit: expansion vessel, 3 bar inlet pressure reducing valve, 6 bar safety valve, ½" T&P relief valve, and tundish. Anti-vibration feet, condensate drain fitting and two 160mm duct adaptors are also included. The installer will need to supply ducting and any additional plumbing fittings to suit the specific installation.
Yes. The unit accepts an external PV signal input — when connected to a compatible solar diverter or export controller, it will switch to heating mode automatically when excess generation is available, using free solar electricity to heat the tank rather than exporting it to the grid.
In many cases, yes — the AquaSustain has a similar footprint to a standard 200L unvented cylinder and includes the G3 safety kit. The main additional requirements are a suitable air duct connection (150/160/200mm) and sufficient space for the unit's height of 1,540mm. Installation must be carried out by a G3-qualified engineer and notified to building control under Part G3.
🔧 Installation Notes
The OSO AquaSustain DHP 200L is a mains-pressure unvented heat pump water heater and must be installed by a G3-qualified engineer in accordance with Building Regulations Part G3, Part F (ventilation) and the manufacturer's installation manual. Key requirements are summarised below.
For full installation instructions, please refer to the manufacturer's installation manual supplied with the unit.
