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You're a star - it did ping off incredibly easily and al became obvious. We now have hot water! Thanks again.

Thanks for that - should it just ping off with a screwdriver?

The central heating system is a Viessemann oil boiler with a very small seperate water cylinder. It's located about 10 metres from the original immersion heater, in a room accessed from outside the main buiding and does indeed feed different outlets to the unvented cylinder (all cylinders in...

Whilst we wait for an oil delivery we've had to turn our central heating / on demand hot water boiler off. Luckily, we still have the old hot water tank (electric immersion heater) which I turned on this morning. The challenge is that I know it's heating the water, but I can't get any more than...