Interest in heat pumps has increased dramatically in recent years
There are two issue in heating a home with a heat-pump:<p>- one is for new homes, well insulated that do not demand much energy and have a p.v. system, so they need ways to minimize all costs, one way is if space is not an issue, to heat large quantity of water and store them to grab heat at night. For instance if you need 40kWh to heat the home for a night having something able to push 1000l of water let&#x27;s say from 20 to 60℃ quickly enough to run on winter Sun from p.v. means free heat for the night [1];<p>- one is for those with old homes, who simply need MUCH thermal energy. They do not have much choices, so they need powerful heat-pumps and in that case low temp heating it&#x27;s not much an option, they need high temperature water.<p>This is interesting for another consideration: most &quot;efficient&quot; electrical devices are built to consume less overall, but their load profile is TERRIBLE for a p.v. inverter. Witch means that a modern tumbler with a heat-pump not only costs more and last less than a classic ones but if you have p.v. it means LESS self-consumption. Similarly for ovens who try &quot;pushing the heat&quot; instead of give large amount of energy: they tend to have pulse loads that are terrible for a p.v. inverter. That&#x27;s a thing their OEMs must consider in the present and future models.<p>[1] if some are curious thermal kWh = 4.2 kJ&#x2F;kg·℃ * (initial_temp-final_temp) * volume_in_liters * 1&#x2F;3600 h&#x2F;s witch means in the above example 4.2<i>(60-20)</i>1000*(1&#x2F;3600) = 46.67kWh