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Hello, I am going to need to replace the two in my airing cupboard and I've been informed I have to replace them with Sunvics. I can't use other manufacturers as it would mean replacing the valves as well. Is that correct? I have an SZM1802 and an SZM1803. Thanks.

My house is about ten years old and I moved in during 2014. In the last 2/3 months I had a suspicion I had developed an electrical fault as I have had problems with getting hot water. I could turn on the central heating and a 'C' status would show on the boiler in the kitchen but nothing would...