I'll try again.
What would you hazard a guess at my CH system volume to be? Std 3 bed semi, 7 rads of which (1 double, 1 tiny, 1 medium), 15mm pipework except flow & return between up & downstairs (ie 2 * 2m * 22mm diam). No cylinder, converting to combi. It's to determine if the expansion vessel is adequate. 100 litres is the make or break.
Thanks, Mike W
A rule of thumb is 10 litres per rad + 10 litre for the boiler.
Another way is to ask if you have seen many normal 3 bed semi installations with additional expansion vessels.
You could look up the water content of the radiators on the webs sites and do some calculations.
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