Better be absolutely clear about the Grant boiler.That seems a bit of an obvious design flaw. I wonder why they don't make it out of stainless steel.
The secondry heat exchanger is stainless steel and that's where the heating return connects into.
Recommended return temperature when up to temperature of 50 but not below 40.
I wouldn't argue that houndsfield boilers are ok but there range is small, no combi (I'm away of there rational for that) so there range covers less than 40% of the oil boilers we fit .
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