Simplest way to replace the boiler...
In that case, even more extensive mods would be needed if it *is* a
gravity
HW system.
It is easy to modify C Plan by adding an additional pump on the hot water
side. Alternatively, most modernish boilers can have the gravity hot water
capped off and have S/Y on the heating side. Check first, though, as some
boilers require a reliable gravity circuit for heat dumping.
Christian.
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