We are happy to update the R290 EVI inverter heat pump 12kw to you. As there are more demand for such heat pump recently.   Still, some of our partner with doubts about this R290 EVI inverter heat pump. As they think R290 is Propane, it is a gas. Which is flammable, it’s explosive.   Yes, it is one of the feature for R290 refrigerant, but it’s a great refrigerant which has a low climate impact because it is not being burnt for heat but used in a vapour compression cycle. Propane is one of the hydrocarbon natural refrigerants and in many ways propane as a refrigerant is similar to CO2. As part of the natural refrigerant classification it is low GWP (global warming potential), will not be subject to regulatory restrictions and is widely available at low cost. As a pure refrigerant rather than a blend such as an HFO there are two advantages. Firstly, there is no glide which makes for an efficient heat pump. Secondly, the system can be topped up without affecting the refrigerant balance and therefore operation. So far so similar to CO2. Propane heat pumps are ideal for medium temperature requirements. Our propane heat pump is called the ‘Aspen’ and is ideal for smaller applications – affordable, low carbon and superb heat service.   The efficiency as measured by COP is sensitive to flow temperature and not so sensitive to return temperature which is the opposite of noncritical CO2. Propane heat pumps are mainly used at 60C and below flow where realistic CO's are about 2.8. Higher CO's are possible at lower flow temperatures.   The flexibility on return temperatures, between 30 and 50C, makes propane suitable for poorly controlled, low DT systems. Despite this, nearly all systems will require some modification in heat emitter selection, controls valves and logic. This is true of any heat pump that is replacing a fossil gas boiler.   We are happy to offer further technical data about R290 EVI inverter heat pump, contact us right now.