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Flow 0 deg return 0 deg, extremely efficient, no steam no alum in the atmosphere blah blah blah
Agile said:Its generally recommended that the boiler output on a system boiler is at least 10*C above the target stored water temperature which is recommended to be 55-60 rather than the 60-65 often quoted here.
Many of the latest condensing boilers can operate with a temp diff of greater than 20*C which can give better economy with good heating performance.
Tony
How do you decide how much to oversize the rads to get a reasonable balance between effy and cost Do you just estimate 10% or can it be easily worked out.
I'm dim, but what is an average return temp?
Vaillant's own modulating controls float the flow and return temps according to demand.
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