According to the product, they ought to very last no less than twenty years 3, and there’s ordinarily no want for substitute parts during their life span. A fast yearly services ought to keep it working Fortunately for many years to return. British Gas is putting in air source heat https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/