John Stumbles wrote:

Although the temperature at the inlet to the combi may be hot, there
should be no flow, therefore no demand, until the temperature falls
below the TMV set point. Therefore the combi should only be heating warm,
never hot, water.

Many combis have a maximum input temp in the low 20's, hence with the
solar water at say 30 to 40 degrees, and the selected blended output at
60, the combi will still be required to do half the lifting.


--
Cheers,

John.

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