Discuss Setting central heating flow temperature in the Central Heating Forum area at PlumbersForums.net
Thats so the return should come back at a low enough temperature to condense? Have noticed when serving some domestic boilers they hardly condense at all after initial start up.Depends on system design temperature but these days maximum of 65 dc
There are a few methods that will give meaningful condensing with return temps of 35/45C, including TRVs and outside temperature compensation. TRVs can give a very rapid house heat up from cold and then return very low return temps but they achieve this by throttling the water flow which can result in very high heat exchanger deltaTs which will trip most gas boilers if > 30C. Outside temperature (weather) compensation can also give very low return temps depending on the curve setting but depending on the temperature setting which may only be 40/45C can give a much slower house heat up.Thats so the return should come back at a low enough temperature to condense? Have noticed when serving some domestic boilers they hardly condense at all after initial start up.
As a consumer I completely agree, I personally couldn't care less if they condense or not (for the sake of a few more % efficiency), I just want the house to be warm so I don't get complaints from the wife!Most people want very rapid house heating and don't really care about condensing, one reason IMO why you can frequently see little or none.
I think you meant to wiite:One of the problems associated with OT control or Opentherm? is that if the boiler cycles due to its min output being < heating demand is that the boiler can have great difficulty in modulating down fast enough on re firing to avoid tripping out on flow temperature, there are numerous posts on here re that problem.
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