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Are the fittings and pipe interchangable?Having run some polyplumb i needed some 22-15 red but merchants only had hep20 , the guy who served said he was sure they would fit.I'm unsure and having asked him if he was going to come out and help repair any leaks he was suddenly not so sure...

after recenctly turning her boiler back on my sisters greenstar does not get past displaying 20% in its intial purge sequence.it's a conventional boiler with 3 zone valves cylinder stat but no room stats or programmer?the pump turns on and off as the boiler clicks on and off.i am thinking...