Heat pump myth 5: Heat pumps don’t work well when the air temperature is below freezing

The truth: Heat pumps designed for the UK market can work down to -25 degrees C. 

Modern air-water heat pumps, designed for heating, can efficiently generate energy from cold air right down to -25 degrees. Our advice is to look at the performance details of products you are considering and make sure that it can deliver the flow temperatures the property requires even when the temperature is cold outside. 


At Stiebel Eltron we design for low temperatures. All our heat pumps have large surface areas which means they work better at low temperatures. Some models also feature enhanced vapour injection (EVI) which ensures high flow temperatures even when it is really cold