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I see where I was going wrong... I thought that if I had 22 lpm I would have to find a combi to suit the flow needs. I understand now that even if I have 22 lpm I could still fit a 25kw combi but the lpm of hot will be limited to what the boiler can give out. So even though I have 18 lpm at my...

Heating would never be an issue at my home, as I only have six radiators (only one double). I'm just trying to get a better understanding on how to calculate what boiler size will be correct for cost reasons, and efficiency. So when I have a 28kw I would of liked to see a flow rate of 13 lpm not 18.

hi, I'm struggling to get my head around what kw boiler to fit for customers who need a combi. I've never had to survey a job (normally done by someone else). I've read that a rule of thumb is 1 lmp = 2.5kw So I've tested my own home and I have 18 lpm from the main and 9 lpm from the hot tap...