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Inta Heat Pump Automatic Differential Bypass Valve 28mm — ABPS28CP Straight ABPA28CP Angled — Compression Fittings
Inta Heat Pump Automatic Differential Bypass Valve 28mm — ABPS28CP Straight ABPA28CP Angled — Compression Fittings
The Inta 28mm Automatic Differential Bypass Valve is a manually adjustable differential-pressure bypass valve for 28mm heating and heat pump pipework, available in two configurations: ABPS28CP (straight) for in-line installation on a bypass spur, and ABPA28CP (angled) for fitting at a 90° corner between parallel flow and return connections. Designed by Intatec specifically for heat pump systems that use 28mm primary pipework, these valves stabilise circulation, maintain the required minimum flow rate through the heat pump, and protect the pump from running against a closed head when zone valves or TRVs shut down. The visual adjustment dial sets the bypass opening differential pressure from 0.1 to 0.5 bar — matched to the system's pump curve and the heat pump manufacturer's minimum flow specification. Maximum working pressure 10 bar, maximum temperature 100°C, flow capacity 1 to 5 m³/h.
⚡ ABPS28CP vs ABPA28CP — Which configuration?
ABPS28CP (straight): Inlet and outlet are in-line — fits on a short straight bypass spur connecting two parallel sections of 28mm flow and return pipework. The most compact installation where flow and return run alongside each other.
ABPA28CP (angled): Inlet and outlet at 90° — fits directly at a corner between 28mm flow and return pipework without additional bends or offsets. Most commonly used adjacent to the heat pump or in airing cupboard installations where flow and return enter from different wall faces.
Both variants are functionally identical — the choice is determined entirely by the pipework layout at the installation point.
ABPS28CP (straight): Inlet and outlet are in-line — fits on a short straight bypass spur connecting two parallel sections of 28mm flow and return pipework. The most compact installation where flow and return run alongside each other.
ABPA28CP (angled): Inlet and outlet at 90° — fits directly at a corner between 28mm flow and return pipework without additional bends or offsets. Most commonly used adjacent to the heat pump or in airing cupboard installations where flow and return enter from different wall faces.
Both variants are functionally identical — the choice is determined entirely by the pipework layout at the installation point.
ℹ Why 28mm? Heat pump systems require larger pipework
Air source heat pump systems operate at lower flow temperatures and higher flow rates than gas boilers — achieving the same heat output requires moving significantly more water. For this reason, heat pump primary circuits are typically designed in 28mm rather than 22mm pipework to minimise pressure drop and ensure the pump can deliver the manufacturer's minimum required flow rate. The ABPS28CP / ABPA28CP are the correct bypass valves for these 28mm primary circuits; using a 22mm bypass valve with reducing adaptors would create unnecessary restriction and pressure drop.
Air source heat pump systems operate at lower flow temperatures and higher flow rates than gas boilers — achieving the same heat output requires moving significantly more water. For this reason, heat pump primary circuits are typically designed in 28mm rather than 22mm pipework to minimise pressure drop and ensure the pump can deliver the manufacturer's minimum required flow rate. The ABPS28CP / ABPA28CP are the correct bypass valves for these 28mm primary circuits; using a 22mm bypass valve with reducing adaptors would create unnecessary restriction and pressure drop.
Features & Benefits
✔ Adjustable 0.1–0.5 Bar — Visual Dial
The bypass opening pressure is set via a visual dial on the valve body, adjustable from 0.1 to 0.5 bar differential pressure. This allows the installer to calibrate the bypass precisely to the heat pump's pump operating curve and the manufacturer's stated minimum flow requirement. A setting of 0.2–0.3 bar is typical for most domestic heat pump systems; the correct value should be confirmed against the pump curve and system hydraulic calculations at commissioning.
✔ Protects the Heat Pump — Minimum Flow Maintained
Heat pump manufacturers specify a minimum flow rate through the heat exchanger at all times — if flow falls below this threshold, the heat pump triggers a fault, goes into low-flow protection mode, or reduces output. When zone valves close down or UFH circuits limit flow, the bypass opens to maintain circulation. This is particularly important in multi-zone heat pump installations where individual zones can be off while others are calling — the bypass ensures the heat pump circuit always has adequate flow.
✔ Protects the Circulation Pump
Without a bypass, a circulation pump running against a closed or near-closed system creates a condition known as closed-head pumping — the pump circulates in a tight loop with minimal flow, overheating the motor, and creating high differential pressure that stresses pipework joints and heat exchanger plates. The bypass valve prevents this by providing an alternative flow path as soon as the differential pressure reaches the set point.
✔ 1–5 m³/h Flow Capacity
A flow capacity range of 1 to 5 m³/h (approximately 17–83 litres/minute) covers the full range of domestic heat pump primary circuit flow rates — from a modest 3–5 kW micro-system to a 16 kW multi-zone installation running at maximum duty. The 28mm bore ensures low resistance even at higher flow rates.
✔ 28mm Compression — No Specialist Tooling
Standard 28mm compression fittings connect directly to copper tube without soldering or specialist tools — appropriate for retrofit on existing 28mm pipework or new installations. The compression connections also allow the valve to be removed for replacement without cutting the pipework, simplifying future servicing.
✔ Reduces System Noise from Zone Valves
As UFH circuits and zone valves close down during a heat pump heating cycle, increasing flow restriction can cause pipework noise and pump whine. The bypass valve opens progressively to maintain a stable system pressure and prevents the pressure surges that propagate as noise through 28mm pipework runs. This is particularly noticeable in open-plan properties where pipework passes through habitable areas.
Technical Specifications
| Manufacturer | Intatec (Inta) |
| Part Numbers | ABPS28CP (straight) / ABPA28CP (angled) |
| Connection Size | 28mm compression |
| Configuration | ABPS28CP: straight (in-line) · ABPA28CP: angled (90°) |
| Differential Pressure Range | 0.1 – 0.5 bar (adjustable via visual dial) |
| Flow Capacity | 1 – 5 m³/h (approx. 17–83 litres/min) |
| Max Working Pressure | 10 bar |
| Max Working Temperature | 100°C |
| Operation Type | Automatic differential pressure — no electrical connection |
| Typical Applications | Air source heat pump primary circuits; multi-zone CH systems; UFH manifold installations; systems with zone valves on 28mm pipework |
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-65%Inta Heat Pump Automatic Differential Bypass Valve 28mm — ABPS28CP Straight ABPA28CP Angled — Compression Fittings—
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Inta Heat Pump Automatic Differential Bypass Valve 28mm — ABPS28CP Straight ABPA28CP Angled — Compression Fittings
The Inta 28mm Automatic Differential Bypass Valve is a manually adjustable differential-pressure bypass valve for 28mm heating and heat pump pipework, available in two configurations: ABPS28CP (straight) for in-line installation on a bypass spur, and ABPA28CP (angled) for fitting at a 90° corner between parallel flow and return connections. Designed by Intatec specifically for heat pump systems that use 28mm primary pipework, these valves stabilise circulation, maintain the required minimum flow rate through the heat pump, and protect the pump from running against a closed head when zone valves or TRVs shut down. The visual adjustment dial sets the bypass opening differential pressure from 0.1 to 0.5 bar — matched to the system's pump curve and the heat pump manufacturer's minimum flow specification. Maximum working pressure 10 bar, maximum temperature 100°C, flow capacity 1 to 5 m³/h.
⚡ ABPS28CP vs ABPA28CP — Which configuration?
ABPS28CP (straight): Inlet and outlet are in-line — fits on a short straight bypass spur connecting two parallel sections of 28mm flow and return pipework. The most compact installation where flow and return run alongside each other.
ABPA28CP (angled): Inlet and outlet at 90° — fits directly at a corner between 28mm flow and return pipework without additional bends or offsets. Most commonly used adjacent to the heat pump or in airing cupboard installations where flow and return enter from different wall faces.
Both variants are functionally identical — the choice is determined entirely by the pipework layout at the installation point.
ABPS28CP (straight): Inlet and outlet are in-line — fits on a short straight bypass spur connecting two parallel sections of 28mm flow and return pipework. The most compact installation where flow and return run alongside each other.
ABPA28CP (angled): Inlet and outlet at 90° — fits directly at a corner between 28mm flow and return pipework without additional bends or offsets. Most commonly used adjacent to the heat pump or in airing cupboard installations where flow and return enter from different wall faces.
Both variants are functionally identical — the choice is determined entirely by the pipework layout at the installation point.
ℹ Why 28mm? Heat pump systems require larger pipework
Air source heat pump systems operate at lower flow temperatures and higher flow rates than gas boilers — achieving the same heat output requires moving significantly more water. For this reason, heat pump primary circuits are typically designed in 28mm rather than 22mm pipework to minimise pressure drop and ensure the pump can deliver the manufacturer's minimum required flow rate. The ABPS28CP / ABPA28CP are the correct bypass valves for these 28mm primary circuits; using a 22mm bypass valve with reducing adaptors would create unnecessary restriction and pressure drop.
Air source heat pump systems operate at lower flow temperatures and higher flow rates than gas boilers — achieving the same heat output requires moving significantly more water. For this reason, heat pump primary circuits are typically designed in 28mm rather than 22mm pipework to minimise pressure drop and ensure the pump can deliver the manufacturer's minimum required flow rate. The ABPS28CP / ABPA28CP are the correct bypass valves for these 28mm primary circuits; using a 22mm bypass valve with reducing adaptors would create unnecessary restriction and pressure drop.
Features & Benefits
✔ Adjustable 0.1–0.5 Bar — Visual Dial
The bypass opening pressure is set via a visual dial on the valve body, adjustable from 0.1 to 0.5 bar differential pressure. This allows the installer to calibrate the bypass precisely to the heat pump's pump operating curve and the manufacturer's stated minimum flow requirement. A setting of 0.2–0.3 bar is typical for most domestic heat pump systems; the correct value should be confirmed against the pump curve and system hydraulic calculations at commissioning.
✔ Protects the Heat Pump — Minimum Flow Maintained
Heat pump manufacturers specify a minimum flow rate through the heat exchanger at all times — if flow falls below this threshold, the heat pump triggers a fault, goes into low-flow protection mode, or reduces output. When zone valves close down or UFH circuits limit flow, the bypass opens to maintain circulation. This is particularly important in multi-zone heat pump installations where individual zones can be off while others are calling — the bypass ensures the heat pump circuit always has adequate flow.
✔ Protects the Circulation Pump
Without a bypass, a circulation pump running against a closed or near-closed system creates a condition known as closed-head pumping — the pump circulates in a tight loop with minimal flow, overheating the motor, and creating high differential pressure that stresses pipework joints and heat exchanger plates. The bypass valve prevents this by providing an alternative flow path as soon as the differential pressure reaches the set point.
✔ 1–5 m³/h Flow Capacity
A flow capacity range of 1 to 5 m³/h (approximately 17–83 litres/minute) covers the full range of domestic heat pump primary circuit flow rates — from a modest 3–5 kW micro-system to a 16 kW multi-zone installation running at maximum duty. The 28mm bore ensures low resistance even at higher flow rates.
✔ 28mm Compression — No Specialist Tooling
Standard 28mm compression fittings connect directly to copper tube without soldering or specialist tools — appropriate for retrofit on existing 28mm pipework or new installations. The compression connections also allow the valve to be removed for replacement without cutting the pipework, simplifying future servicing.
✔ Reduces System Noise from Zone Valves
As UFH circuits and zone valves close down during a heat pump heating cycle, increasing flow restriction can cause pipework noise and pump whine. The bypass valve opens progressively to maintain a stable system pressure and prevents the pressure surges that propagate as noise through 28mm pipework runs. This is particularly noticeable in open-plan properties where pipework passes through habitable areas.
Technical Specifications
| Manufacturer | Intatec (Inta) |
| Part Numbers | ABPS28CP (straight) / ABPA28CP (angled) |
| Connection Size | 28mm compression |
| Configuration | ABPS28CP: straight (in-line) · ABPA28CP: angled (90°) |
| Differential Pressure Range | 0.1 – 0.5 bar (adjustable via visual dial) |
| Flow Capacity | 1 – 5 m³/h (approx. 17–83 litres/min) |
| Max Working Pressure | 10 bar |
| Max Working Temperature | 100°C |
| Operation Type | Automatic differential pressure — no electrical connection |
| Typical Applications | Air source heat pump primary circuits; multi-zone CH systems; UFH manifold installations; systems with zone valves on 28mm pipework |
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Inta 28mm Automatic Differential Bypass Valve is a manually adjustable differential-pressure bypass valve for 28mm heating and heat pump pipework, available in two configurations: ABPS28CP (straight) for in-line installation on a bypass spur, and ABPA28CP (angled) for fitting at a 90° corner between parallel flow and return connections. Designed by Intatec specifically for heat pump systems that use 28mm primary pipework, these valves stabilise circulation, maintain the required minimum flow rate through the heat pump, and protect the pump from running against a closed head when zone valves or TRVs shut down. The visual adjustment dial sets the bypass opening differential pressure from 0.1 to 0.5 bar — matched to the system's pump curve and the heat pump manufacturer's minimum flow specification. Maximum working pressure 10 bar, maximum temperature 100°C, flow capacity 1 to 5 m³/h.
⚡ ABPS28CP vs ABPA28CP — Which configuration?
ABPS28CP (straight): Inlet and outlet are in-line — fits on a short straight bypass spur connecting two parallel sections of 28mm flow and return pipework. The most compact installation where flow and return run alongside each other.
ABPA28CP (angled): Inlet and outlet at 90° — fits directly at a corner between 28mm flow and return pipework without additional bends or offsets. Most commonly used adjacent to the heat pump or in airing cupboard installations where flow and return enter from different wall faces.
Both variants are functionally identical — the choice is determined entirely by the pipework layout at the installation point.
ABPS28CP (straight): Inlet and outlet are in-line — fits on a short straight bypass spur connecting two parallel sections of 28mm flow and return pipework. The most compact installation where flow and return run alongside each other.
ABPA28CP (angled): Inlet and outlet at 90° — fits directly at a corner between 28mm flow and return pipework without additional bends or offsets. Most commonly used adjacent to the heat pump or in airing cupboard installations where flow and return enter from different wall faces.
Both variants are functionally identical — the choice is determined entirely by the pipework layout at the installation point.
ℹ Why 28mm? Heat pump systems require larger pipework
Air source heat pump systems operate at lower flow temperatures and higher flow rates than gas boilers — achieving the same heat output requires moving significantly more water. For this reason, heat pump primary circuits are typically designed in 28mm rather than 22mm pipework to minimise pressure drop and ensure the pump can deliver the manufacturer's minimum required flow rate. The ABPS28CP / ABPA28CP are the correct bypass valves for these 28mm primary circuits; using a 22mm bypass valve with reducing adaptors would create unnecessary restriction and pressure drop.
Air source heat pump systems operate at lower flow temperatures and higher flow rates than gas boilers — achieving the same heat output requires moving significantly more water. For this reason, heat pump primary circuits are typically designed in 28mm rather than 22mm pipework to minimise pressure drop and ensure the pump can deliver the manufacturer's minimum required flow rate. The ABPS28CP / ABPA28CP are the correct bypass valves for these 28mm primary circuits; using a 22mm bypass valve with reducing adaptors would create unnecessary restriction and pressure drop.
Features & Benefits
✔ Adjustable 0.1–0.5 Bar — Visual Dial
The bypass opening pressure is set via a visual dial on the valve body, adjustable from 0.1 to 0.5 bar differential pressure. This allows the installer to calibrate the bypass precisely to the heat pump's pump operating curve and the manufacturer's stated minimum flow requirement. A setting of 0.2–0.3 bar is typical for most domestic heat pump systems; the correct value should be confirmed against the pump curve and system hydraulic calculations at commissioning.
✔ Protects the Heat Pump — Minimum Flow Maintained
Heat pump manufacturers specify a minimum flow rate through the heat exchanger at all times — if flow falls below this threshold, the heat pump triggers a fault, goes into low-flow protection mode, or reduces output. When zone valves close down or UFH circuits limit flow, the bypass opens to maintain circulation. This is particularly important in multi-zone heat pump installations where individual zones can be off while others are calling — the bypass ensures the heat pump circuit always has adequate flow.
✔ Protects the Circulation Pump
Without a bypass, a circulation pump running against a closed or near-closed system creates a condition known as closed-head pumping — the pump circulates in a tight loop with minimal flow, overheating the motor, and creating high differential pressure that stresses pipework joints and heat exchanger plates. The bypass valve prevents this by providing an alternative flow path as soon as the differential pressure reaches the set point.
✔ 1–5 m³/h Flow Capacity
A flow capacity range of 1 to 5 m³/h (approximately 17–83 litres/minute) covers the full range of domestic heat pump primary circuit flow rates — from a modest 3–5 kW micro-system to a 16 kW multi-zone installation running at maximum duty. The 28mm bore ensures low resistance even at higher flow rates.
✔ 28mm Compression — No Specialist Tooling
Standard 28mm compression fittings connect directly to copper tube without soldering or specialist tools — appropriate for retrofit on existing 28mm pipework or new installations. The compression connections also allow the valve to be removed for replacement without cutting the pipework, simplifying future servicing.
✔ Reduces System Noise from Zone Valves
As UFH circuits and zone valves close down during a heat pump heating cycle, increasing flow restriction can cause pipework noise and pump whine. The bypass valve opens progressively to maintain a stable system pressure and prevents the pressure surges that propagate as noise through 28mm pipework runs. This is particularly noticeable in open-plan properties where pipework passes through habitable areas.
Technical Specifications
| Manufacturer | Intatec (Inta) |
| Part Numbers | ABPS28CP (straight) / ABPA28CP (angled) |
| Connection Size | 28mm compression |
| Configuration | ABPS28CP: straight (in-line) · ABPA28CP: angled (90°) |
| Differential Pressure Range | 0.1 – 0.5 bar (adjustable via visual dial) |
| Flow Capacity | 1 – 5 m³/h (approx. 17–83 litres/min) |
| Max Working Pressure | 10 bar |
| Max Working Temperature | 100°C |
| Operation Type | Automatic differential pressure — no electrical connection |
| Typical Applications | Air source heat pump primary circuits; multi-zone CH systems; UFH manifold installations; systems with zone valves on 28mm pipework |
