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Half of our house is very old and the CH in it appears to be a single pipe system. As a result, the rads in that part never get very hot - especially upstairs. We are getting a new boiler soon and the plumber (a trustworthy guy we've known for years) suggests it might be worth putting this...

My old gas boiler is coming to the end of its life so will need replacing soon with a whizzy super-efficient new one. Currently, the boiler just does the heating and the water is on off-peak electricity. The question is, do we convert the water over to gas heating when we change the...