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Bleeding a water based central heating system is a DIY job anyone can do. Find the bleed valves and crack each one open a bit (only one at a time though you don't want flooding). You should be hearing a hiss as air is pushed out. At some point water will get pushed out, careful it can be hot if the system is on, which is your sign to shut the valve again. ...


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Since this is a new-build, I would focus really hard on passive solar design. This is a new concept of building, with different materials and practices - it's not a glue-on afterthought to a conventionally built house). This type of design is likely to be earth sheltered, heavily insulated, have huge thermal mass inside the insulation envelope, windows ...


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It is better to keep a hot water hydronic heating system full of water all the time. This keeps air out, and prevents the inside of the radiators from rusting (assuming these are traditional cast iron rads). Recirculating the same water also helps limit the introduction of minerals from your water supply, so your rads and boiler won't clog up with mineral ...



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