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This graph estimates the annual gas savings that

This graph estimates the annual gas savings that could be made when switching to a more efficient boiler as you might expect, the less efficient the old boiler is (g is the lowest rating) and the larger the house is (detached homes need the most heating), the more savings that can be made. It’s a mostly male dominated sector of work but, over the last few years, a number of all-female plumbing companies.

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