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Our central heating system was fitted with 22mm female fittings for the thermostats on the radiators. We are now having problems getting 22mm thermostatic valves as all the ones we've seen are 15mm. Can you still buy 22mm, or are 15mm now the standard. To change would mean all the...

We have just fitted a new pump after suffering a very cold christmas with no heating. Our system is up and running beautifuly, all the rads have been bled, all running well, accept one rad, it appears to be the last one and although we have bled it several times and been able to get hot water...