In a property (3 bed house) with heating all taken care of by air to air heat pump, what is the most effective way to provide hot water for the kitchen sink and downstairs wc, plus bathroom and en-suite upstairs?

 

I'm envisaging an electric boiler in the utility room for downstairs and another in a cupboard upstairs for basins and 2 showers. Not having a bathtub.

 

Any actual experience? If not, expert advice welcome. Not eligible for govt. grants.

Unusual choice.  While Air to air is good, to fit that without thinking about how water is strange.  An ASHP with hot water tank would have been a better choice.

 

So probably best choice now is a direct hot water cylinder heated bu immersion heater, using off peak tarrifs if available.

You can get a water cylinder with a heat pump built in, that may be the cheapest to run, though the most expensive to buy (the Ecocent is just a branded Chinesium model at 4 times the price).

 

While an E7 DHW system is cheap to run and install, it does mean that your daytime electricity is expensive, that will negate much of the savings if the A2A heating.

Instantaneous water heaters are good, but need to be high power i.e. 10 kW or more. This may mean updating the consumer unit. You may need a water softener as well.

 

So really just a case of booting up Excel and working it all out.