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Gas Absorption Heat Pump - The Fusion and Fusion Hybrid

The gas absorption heat pump that’s low-carbon and efficient. Combining renewable energy with gas to deliver in any season – even sub-zero conditions.

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The Remeha Fusion 35kW Gas Absorption Heat Pump (GAHP) is a practical, proven low-carbon, low-NOx heating solution, suitable for new builds and existing commercial, industrial and residential buildings. It takes energy from the surrounding air which is converted to a higher temperature with the aid of refrigerants.

By combining renewable energy with gas input, while using the gas condensing heat generator to maintain high operational efficiencies, Remeha Fusion can increase the thermal output. This offers exceptionally high seasonal efficiencies of 120-130%. So even when it’s sub-zero/very low temperature outside, continuous heating is provided – even in the defrost phase.

Available as a single unit, or in cascades of up to 40 units, they can be used as the sole supplier of low-carbon heating, or alongside commercial condensing boilers. The Remeha Fusion Hybrid is an industry-leading bespoke solution that combines the Remeha Fusion and Remeha Quinta Pro condensing boilers to meet the individual needs of a building.

The two energy-saving technologies are fully integrated through a specially configured BMS known as Remeha Touch, to maximise efficiencies and savings.

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  • Features and benefits
  • Literature library
  • Technical information
  • A versatile solution to low-carbon heating
  • Suitable for use in both new build and refurbishment projects
  • Proven high performance and highly efficient – even at low/sub-zero outside temperatures
  • Uses gas as primary energy source at point of use, providing 98% of usable heat energy
  • Ammonia/water solution used as refrigerant for an environmentally friendly solution with zero global warming and zero ozone depletion potential/li>
  • Condensing heat generator that achieves Class 5 NOx levels
  • Qualifies for five BREEAM credits – enabling significant improvement of a building's environmental rating
  • Easily retrofitted as a 'bolt on' to serviceable boilers – for a straightforward and affordable retrofit choice
  • Available in a bespoke system combining Fusion Hybrid and Quinta Pro condensing boilers. Tailored options can meet the needs of a building with specially configured BMS to maximise efficiencies

Gas Absorption Heat Pump Documents

Technical SheetFusion GAHP 35A HT Technical Sheetpdf
Specification GuideFusion Specification Guidepdf

Technical information

Fusion GAHP 35A HT
Gas absorption heat pump 35AHT
Air-to-water heat pump Yes Low-temperature heat pump No
Water-to-water heat pump No Equipped with a supplementary header No
Brine-to-water heat pump No Heat pump combination No
Parameters shall be declared for medium-temperature application
Parameters shall be declared for average, colder and warmer climate conditions
Average climate conditions
Rated heat output Prated kW 29.3 Seasonal space heating energy efficiency ns % 112
Declared capacity for heating for part load at indoor Declared coefficient of performance or primary energy ratio for part
temperature 20oC and outdoor temperature TJ load at indoor temperature 20oC and outdoor temperature TJ
TJ = -7oC PdH kW 25.8 TJ = -7oC PERd % 97
TJ  = +2oC PdH kW 15.8 TJ  = +2oC PERd % 121
TJ = +7oC PdH kW 10.3 TJ  = +7oC PERd % 118
TJ  = +12oC PdH kW 4.4 TJ  = +12oC PERd % 112
TJ = bivalent temperature PdH kW - TJ = bivalent temperature PERd % -
Annual energy temperature QHE GJ 195
Colder climate conditions
Rated heat output Prated kW 29.2 Seasonal space heating energy efficiency ns % 107
Declared capacity for heating for part load at indoor Declared coefficient of performance or primary energy ratio for
temperature 20oC and outdoor temperature TJ part load at indoor temperature 20oC and outdoor temperature TJ
TJ  = -7oC PdH kW 17.8 TJ  = -7oC Pdh kW 108
TJ  = +2oC PdH kW 10.8 TJ = +2oC Pdh kW 117
TJ  = +7oC PdH kW 7 TJ  = +7oC Pdh kW 112
TJ  = +12oC PdH kW 3.2 TJ  = +12oC Pdh % 110
TJ  = bivalent temperature PdH kW - TJ  = bivalent temperature PERd %
TJ  = operation limit temperature PdH kW 29.2 TJ  = operation limit temperature PERd % 87
For air-to-water heat pumps: PdH kW 23.9 For air-to-water heat pumps: 90
TJ  = -15oC (if TOL=< -20oC) TJ  = -15oC (if TOL=< -20oC)
Annual energy consumption QHE GJ 242
Warmer climate conditions
Rated heat output Prated kW 35.9 Seasonal space heating energy efficiency ns % 115
Declared capacity for heating for part load at indoor Declared coefficient of performance or primary energy ratio for
temperature 20oC and outdoor temperature TJ part load at indoor temperature 20oC and outdoor temperature TJ 118
TJ  = +2oC Pdh kW 35.9 TJ  = +2oC PERd kW 121
TJ = +7oC Pdh kW 23 TJ  = +7oC PERd kW 116
TJ  = +12oC Pdh kW 10.4 TJ  = +12oC PERd kW
TJ  = bivalent temperature Pdh kW - TJ  = bivalent temperature PERd %
Annual energy consumption QHE GJ 150
Bivalent temperature Tbiv oC TOL< Tdesign For air-to-water heat pumps TOL WTOL oC
Opertaion limit temperature -22
Heating water operation limit 65
Power consumption in modes other than active mode
Off mode P OFF kW 0 Rated heat output Psup KW
Thermostat - off mode P TO kW 0.021 Rtype of energy input Monovalent
Standby mode P SB kW 0.005
Cranksae heat mode P OK kW
Other items For air-to-water heat pumps 1000
Capacity control variable Rated air flow rate outdoors m3/h
Sound power level, indoors/outdoors L WA dB -75.3 For water - or brine-to-water heat pumps  
Rated brine or water flow rate, outdoor heat exchanger m3/h
Emissions of nitrogen oxides Nox mg/kWh 40
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