I note from my Worcester Bosch combi boiler installation manual that the
guarantee on the boiler will be invalidated if the pH level of the
circulating water exceeds 8. Clearly this is for a good reason (corrosion of
the aluminium heat exchanger?) and so I would like to keep an eye on this,
even after the 2 year warranty has expired (and warranty on the heat
exchanger is for 10 years).
A quick Google reveals pH monitors costing several hundred pounds - and also
aquarium pH testing kits costing less than £7. I don't know if the latter
would be good enough (or the measurement scale appropriate) for measuring pH
levels in the heating system.
Any advice on the best (and cheapest) way to test the pH level of the CH