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Posted By: Gavin_ADo you plan to have some form of a buffer tank? This can seriously reduce the size of heat pump you need, as it can smooth out the peaks of demand eg on first heating in the morning, so you can use a smaller heat pump.
Posted By: Nick ParsonsHeat pump buffers are as big as you make them. Yes, many suppliers suggest 100 ltr, but one installer I know won't use less than 300 ltr. If you are looking to buffer heat so as to benefit from E7, you'd want more than that, I think.
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