21

Running DHW on a electric emmerson will help a little.
What insulation/airtight can you upgrade?
What about small A2A in living room or top landing?

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22

Yes, I’m not going to be able to achieve the perfect outcome here it seems.

TBH as long as I can get a small saving on the cost heat as I use on gas currently then it’s fine by me.

23

Those of us who have had heat pumps installed find that the boiler efficiency is less than we might be led to believe. The SEDBUK ratings of 92% or whatever are not accurate in real terms. Even with your flow rates set to 40 degrees and the boiler fully condensing you will be lucky to achieve 80% efficiency. So the chances are an 11 kW heat pump is excessive. But in my case a heat loss of 9 kW was calculated but a 14 kW heat pump installed. This larger unit has a much bigger heat exchanger and this is needed where I live because of mist at 2-3 degrees. At 700 ft above sea level we would find that the smaller unit would be be in defrost mode for a lot of the time and therefore be defeated. Note too that hot water takes precedence over heating radiators and UFH. If your family showers you can set the hw thermostat lower and get better COP and it helps to get the biggest hwc you can. We have a 250 litre cylinder. If you use hot water in the kitchen and have a long pipe run from the cylinder consider fitting an under sink water heater. No point pouring water down the sink whilst you wait for hot water to arive and you may want hotter water at the kitchen sink than in the bathroom.

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24

That applies whatever the source of hot water, a heat pump or anything else. I have a friend who lives in a Welsh long house - and it lives up to its name, it’s around 35 m from the hot tank and oil C.H. to the kitchen.

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