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The problem with top outlet/sunken tanks is often the non return valve that is fitted with in the tank. When used in conjunction with the non return valve in the Wallstar it causes restriction between the two valves. The boiler will continue to run for some time as it stretches the fuel between...

The Danfoss transformers are fried by the Satronic TF model control boxes. If you can speak to Danfoss (good luck with that) they will tell you that the Satronic TF boxes have been frying there transformers for years now. HRM will also confirm this. Whenever changing a transformer I would also...