Couple of things to add….
Most GSHP will get domestic hot water to 60degC (depending on the model) and will do it with better efficiencies than an ASHP due to the fairly constant tempeature of the heat source (12-14degC given that its a borehole system). the majority of GSHP will have a coefficient of performance of 3 or 4:1 when delivering DHW, rather than space heating where it can get more efficient. You’ll want a hot water cylinder specifically designed to work with a heat pump. if your heat pump manufacturer doesnt do one, PM me and I can help.
Air Source heat pumps struggle with DHW provision due to the variable temperature of their energy source – they have to work really hard when the air is at or below freezing (in the UK in particular)and their COP can fall to 2:1 or less, which is why a lot of them limit DHW temps to 55 or below, and have to top up with a direct electrical element.
A UNIQ heat battery was mentioned. steer clear.