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Originally Posted by Chris
You may want to try using sources that aren’t 10 years old. I’m heading out shortly so no time, but suffice to say that modern installations need not provide 40*c at the cylinder. They can reach 50*c with an adequately sized cylinder, or 60*c or higher if you add an additional pump inside the house to convert room heat to hot water.
With a heat pump it’s never about whether it can or can’t ‘do’ something. It almost always can. It’s always about the systems installed to manage heat storage, distribution and retention in the home.
The means by which heat is delivered to houses from Norwegian heat pumps is irrelevant to my point - they work, and they continue to work at far lower external temperatures than most of us experience in the UK. The reason people in the UK think they don’t is because our houses are appallingly badly insulated. That’s why warm air ducted heating was only ever a passing fad in the UK, almost invariably replaced by wet radiators after the system became life-expired. If your house is draughty, full of open flues (or badly sealed ones) and with inadequate wall insulation, then the warm air fed through the system is too quickly lost to the outside.
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My issues were with the disruption from installing a heat pump system. Larger radiators, larger tank, location of external equipment.
Water temps are irrelevant to the Norwegian air-to-air systems. No water tanks or radiators involved.
This year.
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Most air source source heat pumps and ground source heat pumps operate at a maximum flow temperature of 55°C, but in order to be efficient they are much better suited to running at flow temperatures of around 35°C to 45°C.
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