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Originally Posted by Chris
Heat pumps operate better at lower output temperatures. The best balance between temperature and practical radiator size is 50*c. This, as it happens, is the same temperature the latest regulations require gas boilers to be operable at. 50*c is also definitely not lukewarm and is easily hot enough to burn your hands. 50*c is more or less what you’d want coming out of the hot tap in your kitchen.
So if you’re getting a new gas boiler and it’s running at 50*c you’re going to have to match the radiators in the house to the new, lower operating temperature. And that’s the same operating temperature as a heat pump.
All this ‘yeah but no but heat pumps don’t work’ is nonsense anyway. Heat pump usage in Europe is highest in some of the coldest places, including Norway where 60% of homes have one. Heat pumps absolutely do work, they do however require an attitude that heat energy should be conserved, rather than carelessly leaked out of the walls.
The British problem is that we burned coal in our homes for two centuries, and that coal was so cheap we never really had to think about keeping the heat in.
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Hot water tank
The heat pump should heat your hot water tank to around 35-40°C. However this is not hot enough to kill any bacteria within the tank. Therefore the tank should be timed to heat up to 60°C once a week - you will notice a corresponding spike in your electricity usage.
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37°C is body temperature, ie lukewarm. A person will output more heat than that, mainly by breathing out of warmer air.
The heat pumps that are used in Norway heat the air, not a tank of water.
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In the period 1987 – 2020, almost 1.4 million heat pumps were sold in Norway.
- Air-to-air approx. 1.25 million
- Air-to-water over 50,000
- Brine-to-water over 55,000
- Ventilation heat pumps over 20,000
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I once lived in a house that had a central heating system that relied on the warm air being distributed to the rooms.