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Hello, Hoping you with more knowledge + experience can help with a quick query.... please :) One of the pump valves started to drip badly this week from the spindle, so I've got them out to replace, so have the pump out. Pump is a Grundfos UPS 15 50x18 Model C No U748 MKII - see picture...

Hey, Could someone tell me what this chamber is for/what it is please? Pipe out the top is the feed/expansion into the heating/dhw circuit (single pipe for both, splits in loft just before header). Right bottom comes from boiler, left bottom goes to pump. Assume it's something to do with...

Hey, I've replaced a 20year old (ish) 12volt transformer with an equivalently rated new one. The lights work - but are noticeably dimmer/yellower. I'm pretty sure this is because the new transformer is 11.4 or 11.5 volts, rather than the 12v of the old one? Does anyone actually make one at...