I've just had my water pressure and flow rate measured by Severn-Trent and it's slightly better: 16 litres/min and 36m head of pressure.
He advised that this was OK for a combi boiler but the concensus here is that 20l/min is the minimum?
M.
No. That's absolutely fine for an instantaneous combi. There is no marginal about it. It's a little low for a mains pressure storage system, but not low enough to stop them working, just enough to make the advantages over an instantaneous combi less compelling.
Christian.
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