Lochinvar introduces absorption heat pump

Lochinvar’s Optimus range of gas absorption heat pumps can deliver outputs of up to 41.7 kW and is capable of operating in ambient temperatures as low as -20°C. These heat pumps can achieve efficiencies of up to 152% with a flow temperature of up to 65°C for space heating and up to 70°C for domestic hot water.

They are usually installed outdoors, but an indoor option is available. Factory-assembled skid packages are available with two to five units and come pre-piped, pre-wired and complete with external sensors and cascade control. Optimus is designed to operate continuously, including in defrost mode.

The refrigerant is a mixture of water and ammonia, which attracts more BREEAM credits

They can use natural gas or propane as the fuel.