From Diana Wilkins, Lewes, East Sussex, UK
David Le Maistre suggests that his gas boiler has a lower carbon footprint than a heat pump. This isn’t the case. As leading energy efficiency expert Jan Rosenow states: “A heat pump delivers about three units of heat for one unit of energy… A gas boiler delivers only about 0.9 units of heat for one unit of energy.” As a result, “the numbers support the early retirement of gas boilers”(Letters, 22 April).
Given the seriousness of the climate crisis, it is important to get this point over.
