Hello, As part of a my extension works we have underfloor heating to the ground floor and radiators on middle and loft floors. We have 4 bathrooms but there are only 3 of us in the house. The builder is recommending a telford sleeper tank (250l) and a vaillant 430 boiler, he says Telford offers good value for money compared to the Heatre Sadia equivalent and that the 30kw boiler is adequate for our use. The sleeper has been suggested beacuse there is a large void under the stairs that would take the tank nicely and use an otherwise dead space. Id be happy to hear views on Telford cylinders and the 430 boiler. Many thanks in advance.