D Rated boiler acceptable?
Just wondered if our boiler is up to spec. It's a Glow-worm Ultimate 40FF. Persimmon new build 2007. I was trying to find a manual online and discovered that the boiler is discontinued and only D rated for energy efficiency. It's not a condensing boiler but fanned flue boiler with hot water cylinder. Property type is terraced. Would appreciate any advice?
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