Hi all.. Maybe you can help me understand why my boiler blew up. We have a Burnham V73 model Hot water boiler system. We also have a coal/wood burner attached to this system. So we have 2 furnaces.Several months back, we had the furnace seviced. First the last heating year we have the front fire wall fall and it had burned the Gauge and Auqastat. It also cracked the cast iron plate on the front of the furance. We had the service technician come out and when he was here, we told him to do what needed to be done to the furnace. Replacing the nozzle, ect. We knew the auqastat needed serviced as it sparked on ignition. The service tech replaced the cast iron front, nozzle, oil filter, drained the expansion tank, front fire wall, and told us he had fixed the aquastat. On the service card he gave the furnace a 83.3/4% efficiency rating and rated the furnace excellent. We also asked him to adjust the valves going to the coal furnace as we were getting too much heat going to this furance and would like more heat forced to the upstairs rooms. Now here we are sitting at home and the furnace is running and "BOOM" ! Husband goes to the basement and inspects the furnace. The pipe on the overflow valve had been blown off, it hit with such force that it make a dent in the cinder block. I call the plumbing company that did the work and explained what had just happened. Now mind you, its the weekend and I'm thinking "Weekend, going to cost me a fortune" for him to come out. Now at this time it has been about 6 months since they had done the work. We had it serviced late summer. The service tech comes out and looks at the furnace. He takes the side panel off and here we see a spray of water coming from the boiler section. He asks to see the service card from the last Tech. He looks at it and runs out of here like a cat with his tail on fire never to be seen again. He left and never came back. We had to call and ask where he went and what about turning the furnace back on as it was getting cold in the house. He told us we could turn the furnace back on, but it was going to leak. What Happened? Why did our furnace blow up? We have never had a problem with this furance~!

I have a Utica propane fired hot water boiler. There is a feed line from my hot water heater to the boiler. Recently, the bronze pressure reducing valve on the feed line began leaking from the top and needed to be replaced. It was replaced with a Watts. According to the metal tag on the replacement valve, the set range is 12 - 15 lbs. The operating range is 10 - 25 lbs. Now, when the water temperature on the boiler is at 185 degrees, the water pressure reads about 24 lbs. My concern is the pressure is too high. Should I be concerned? I have a two zone system with a taco circulator pump for each zone with a boiler drain just below each pump. If the pressure should be reduced, can I open one of the drains until the pressure drops to the 12 -15 lb. range. Will it stay there? Is there any other way to reduce the pressure? Thanks for your help.