My father has an old Aga which also heats the water - Also has an old oil boiler due for renewal, but quotes are sky high for a two-calorifier DHW cylinder plus pipes and controls to accommodate both. As he only uses the Aga for cooking and then only in the winter months, the boiler is on year round doing water heating in summer and could do both in winter using a conventional DHW cylinder.
Question is...
Is it permissible to drain the water out of the Aga and isolate or would it result in the Aga cracking or otherwise self destructing ?
Thanks
Nick