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https://twitter.com/glynhudson/status/1541361982196125698HP is a 5kW Samsung Gen 6 with 150L DHW tank and 7x upgraded radiators in a 200yr old 2 bed end-terrace house with sold stone construction, max heat loss at -3 degC ambient is estimated to be between 3.3kW-4.2kW, 28mm pipework to 3-port, mostly 22mm primary with 15mm drop to rads