ASHP are claimed to be more healthy than fossil-fuelled heating for example gas heaters by protecting a far more even temperature and steering clear of hazardous fumes chance. You'll have space - exterior with the pump and inside of for your h2o storage tank. Some heat pumps might also need https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/