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Thanks very much Dangermouse. Would 15 to 20 year old pipes and radiators cope with a sealed system? Or could there be a potential danger of burst pipes? I am also told that in a sealed system, if a pipe bursts, the pressure drops and the system is not replenished with water, whereas in...

Thanks for your prompt reply, Rog.

I am replacing a very old boiler for a new one. This is for a 4 bedroomed house with two showers. It can be a system boiler or an open vent boiler. I have been recommended Vaillant Ecotec Plus 630, Glow-Worm Ultracom 30 SXI and Worcester Greenstar 30Cdi. Other brands that have been mentioned...