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Doing a bit of a revamp of heating system some rads out new ones in . Took old galvanised expansion tank out of loft. Now I reckon this thing had a capacity of a good 100 litres. Looking at replacements they seem to be 18 litre and that is it. Now I have some 22 rads and what with a run to and from the boiler I recon there is roughly about 300 litres in the system. Using an online calculator it states that my 300 litres say at 5degC will be 317 litres at 75degC. Will not be this as obviously water might leave the boiler at 75degC but the return might be only around 45deg C so average is 60degC hence an averaged rise of 55degC for the sake of calculations. This give a heated volume now of 313.5 litres ie expansion of 13.5 litres.All this is leading to is an 18 litre expansion tank sufficient for my volume of water? If not is there an alternative to not using a cold water cistern sized thing which is way oversized?
Thanks
Thanks