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    Useful efficiency lhv 30 return temperature 30â°c
    Added: 2018-06-29 | Category: boiler service | Comments: 0

    Useful efficiency (lhv - 30%) - return temperature 30â°c. You may also see manufacturers talking about flow rate the flow rate is the amount of water which comes through your taps from the mains, measured in litres per minute your boiler’s flow rate should more or less match your home’s flow rate – which you can find out by putting a container under the cold tap for a minute and measuring how much water it collects. Combi.