Correct boiler for unvented water system ?

kevindgas said:
allow 5000 btu per radiator(some will be more, some less) and 15000 btu to 20,000 for cylinder (210 to 300 litre) and go for nearest one under that calculation and it should be about right

Why do you say 5-7 kW for the cylinder when the energy efficiency curse taught you to allow only 2 kW ?

Tony
 
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