"John Rumm" wrote in message
...
Andy Kaye wrote:

I read that it is not a good idea to have too many thermostatically
controlled radiator valve as it cuts down the efficiency but we only
have them in bedrooms.

Not really a problem with a modulating boiler since it simply reduces
its power output to mathc the reducing load, hence it maintains
operation in an efficent temperature range.

It is a problem. You need a by-pass valve which raises the return
temperature which reduces efficiency. You can get around this by isntalling
a flow switch abd timer. By-pass valves should not be on condesning boilers




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