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    What is it?

    The central heating system in our bungalow is non-sealed and powered by a 25 year old (I believe) Baxi 50?R(or B)S boiler. Probably the original fitment when the bungalow was built in 1980. The indecision about the type is because the printing has partly worn off the label. Circulation of the...
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    What is it, and what does it do?

    Part of the central heating system in our bungalow is a vertical pipe, not quite at the highest point of the system (it is below the header tank) with a brass/bronze 'gismo', 'thingy' or whatever at the top. This device is about 4" high by 1.5" diameter with a Schrader (car tyre) type valve at...
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    Noisy Boiler after flushing

    We recently had to change the Grundfos pump on our central heating system. I bought it and a local plumber/heating engineer fitted. he said that the previous one had failed due to scale in the system. (The system was probably fitted about 20 years ago when the bungalow was built), so he put some...
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