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We have a 10 year old Worcester Bosch 35CDI boiler. Possibly, a little undersized as its heating output is 25 and water 10 and we have 18 radiators. Last summer, April - September we used 90 units of gas in total, when using system for hot water only. Over the winter we have been consuming 30...

Hello, we bought a new house a year ago and it is using about £80 of gas per week at the moment - around 150 units per week for a 4 bedroom house with 2 bathrooms. We run heat for 2 hours in the morning at 20 degrees and 6 hours at night and heat water for around 5 hours morning and evening...