the ideal mexico HE has 4 tappings so you can have a heat circuit and a seperate water circuit fit a zone valve, a stat and pump to each and you have a fully pumped 2 part system that meets the regs!
A good floorstanding but basic high efficiency boiler is the Kidd range.
They are very efficient, shrug off water contamination, heavy, big, very long life expectancy (proven in the field) and ideal partners for older steel piped systems.
They are not at all cheap but rarely give problems, being a fundamentally simple engineering design. Over their long life they represent excellent value.
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