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Thanks for the quick response. I'll give that a try and see what difference that makes.

Hello I have a system boiler with an unvented HW cylinder. There is a Drayton LP522 timer controller. Separate to this, there are 2 thermostats in the house for heating control (house is split into 2 radiator zones). My question relates to the HW cylinder. As I understand it, water in this is...