Absorption
Ammonia-water (NH₃-H₂O) and lithium bromide (H₂O-LiBr) absorption thermodynamic cycles, and Type I and Type II absorption heat pumps.
How it works: AbsorptionEquipment family
Gas heat pumps
Heat pumps that use natural gas or LPG for heating, DHW and cooling, with minimal electricity demand.
- Cooling capacity
- 16,9 – 170 kW
- Heating capacity
- 21 – 225 kW
- Ranges
- 6
- Manufacturers
- Robur and Aisin
Technology
What are gas heat pumps?
A gas heat pump uses natural gas or LPG as its driving energy and also harnesses renewable energy from the air, the ground or water. Its electricity demand is very low, which makes it a good solution for buildings with limited electrical capacity or where full electrification is not viable.
The family brings together two technologies. Robur GAHP absorption heat pumps (the air-source A Plus, the reversible AR Plus, the ground-source GS Plus and the water-source WS Plus) reach a GUE of up to 174 % with the natural refrigerant R717, and Robur LINK packages combine them with chillers and boilers in a prefabricated plant. Aisin GEHP F series gas engine-driven compression heat pumps, with a Toyota engine, provide air conditioning with VRF or hydronic systems and produce DHW with the heat recovered from the engine.
Compression
The compression cycle explained, and how a gas engine-driven compression heat pump works.
How it works: CompressionRanges
gas heat pumps ranges
6 ranges from Robur and Aisin. Nominal data from the manufacturer's technical data sheets.
Robur
Robur GAHP A Plus
Air-source gas absorption heat pumps for heating and DHW
- Heating capacity
- 44.6 kW
- Energy
- Natural gas or LPG + air
- Efficiency
- GUE 172 %
- Energy class
- A+ (A++ low-noise version)
Robur
Robur GAHP AR Plus
Reversible gas absorption heat pumps: heating, cooling and DHW
- Cooling capacity
- 16.9 kW
- Heating capacity
- 38.8 kW
- Energy
- Natural gas or LPG + air
- Efficiency
- GUE 154 % (heating) · 67 % (cooling)
Robur
Robur GAHP GS Plus
Ground-source gas absorption heat pumps
- Heating capacity
- 43.0 kW
- Energy
- Natural gas or LPG + ground
- Efficiency
- GUE 165 %
- Energy class
- A++
Robur
Robur GAHP WS Plus
Water-source gas absorption heat pumps
- Heating capacity
- 45.3 kW
- Energy
- Natural gas or LPG + water
- Efficiency
- GUE 174 %
- Energy class
- A++
Robur
Robur LINK
Prefabricated thermal plants combining heat pumps, chillers and boilers
- Cooling capacity
- 16.9 – 88.5 kW
- Heating capacity
- 21.0 – 225 kW
- Energy
- Natural gas or LPG
- Efficiency
- Depending on configuration
Aisin
Aisin GEHP F series
Gas engine-driven compression heat pumps with a Toyota engine, for VRF or hydronic (AWS) systems
- Cooling capacity
- 42.5 – 170 kW
- Heating capacity
- 50 – 190 kW
- Energy
- Natural gas or LPG
- Efficiency
- SPER heating 1.55
SPER cooling 2.44
Comparison
gas heat pumps comparison
Nominal values from the manufacturer's technical data sheets.
| Range | Manufacturer | Cooling capacity | Heating capacity | Energy | Efficiency | Energy class |
|---|---|---|---|---|---|---|
| Robur GAHP A Plus | Robur | — | 44.6 kW | Natural gas or LPG + air | GUE 172 % | A+ (A++ low-noise version) |
| Robur GAHP AR Plus | Robur | 16.9 kW | 38.8 kW | Natural gas or LPG + air | GUE 154 % (heating) · 67 % (cooling) | A+ |
| Robur GAHP GS Plus | Robur | — | 43.0 kW | Natural gas or LPG + ground | GUE 165 % | A++ |
| Robur GAHP WS Plus | Robur | — | 45.3 kW | Natural gas or LPG + water | GUE 174 % | A++ |
| Robur LINK | Robur | 16.9 – 88.5 kW | 21.0 – 225 kW | Natural gas or LPG | Depending on configuration | Depending on version |
| Aisin GEHP F series | Aisin | 42.5 – 170 kW | 50 – 190 kW | Natural gas or LPG | SPER heating 1.55 SPER cooling 2.44 |
A++ |
The rating conditions for each capacity are given on the range's page.
Selection criteria
When to choose gas heat pumps
- Buildings with limited electrical capacity or a supply that is hard to upgrade
- High domestic hot water demand: hotels, hospitals, care homes and sports facilities
- Refurbishments with existing emitters that need water up to 65 ºC
- Cold climates: the GAHP A Plus keeps a high efficiency at low outdoor temperatures
- Sites without a natural gas grid, using LPG
Projects
Projects with gas heat pumps
Mas Sallent residential estate
District heating with ROBUR air-source gas heat pumps on the Mas Sallent estate
La Ventajola housing development
La Ventajola housing development (La Cerdanya). Gas-fired ground-source heat pumps for heating and DHW.
Hotel Sant Metges, Sant Julià de Ramis
HVAC system with an AISIN GHP gas heat pump at Hotel Sant Metges in Sant Julià de Ramis (Girona)
Downloads
Catalogues and data sheets
Which range suits your project?
Tell us the capacity, the services you need and the energy available. We'll recommend the configuration and send you a proposal.