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    Boiler will not tolerate fewer than 4 radiators on

    Old Chaffoteaux Celtic Plus boiler in house I have moved into. Various problems fixed by BG and boiler working reliably for some time. However have noted CH works fine with all radiators on but if then start turning some off, as soon as only 3 radiators left on, boiler flames go out leaving only...
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    Room thermostat - upgrade to Danfoss Ret-B advisable ?

    I have an old combi boiler in small house controlled by old mechanical 2-wire room thermostat. No TRVs. Thinking of upgrading to new stat so see display of temps and possible narrower hysteresis. The above battery-powered Danfoss claims to be compatible with old stats and has display of...
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    Part P - powers of competent persons

    There is excellent advice in this forum - would be greatful for any comments on the following. I am retired from the IT industry, having gained a degree in electrical engineering in 1970. I've done simple DIY electrics at home over the years but have no trade qualifications or experience. I'm...
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