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Thanks guys. If able to replace TRV's without draining down whole system will be over moon!

That's what they are :!: Could extreme heat or pressure could cause them to snap? Just dreading the investigating and fixing (cost/time involved off work/lack of heat during)... Checked out one famous plumbing company and they charge £90+VAT per hour. And that's whether doing an...

They've actually snapped off (!)- despite being fairly new. System was flushed prior to replacing radiators and valves. I imagine this means draining down again, just to replace them. But looks as if that is necessary anyway to do an investigation and see why system is still not balancing as...

What's the most likely cause for a newish thermostatic valve to physically break (other than accidental physical damage)? We have a 2 year old Keston boiler (sealed system), the system was flushed, sealant used prior to installing the boiler + many new radiators and balanced afterwards...