Hi guys! I was hoping somebody could help me out here. My husband and I have been going absolutely crazy the past couple of weeks thanks to some issues with our boiler. A little background info...We have an old Peerless gas boiler which I believe is original to the house (making it roughly 30 years old). Two weeks ago I heard what sounded like an explosion coming from the basement, (it was LOUD!) followed by all sorts of roaring, clanging, and what I thought to be smoke filling the basement which actually turned out to be steam. I called the fire department because I thought we had a gas explosion. Turns out the pressure relief valve on the boiler blew. Ooops. In my defense it blew things straight across the basement and completely melted the circulator so it did cause quite a ruckus. Anyway, we've since had three different repairmen here to try to solve the problem to no avail. We've had pretty much every part replaced, some of them more than once in the past couple of weeks-zone valves, pressure relief valve, expansion tank, aquastat, water feed valve, circulator, etc. The damn relief valve still blows randomly. I'll hear a loud rush of steam that may last for up to 40 seconds, followed by silence, followed by another loud rush of steam. This may last for up to 3 minutes. I checked tha gage after one of these episodes and the pressure was reading near 90! and the water temp was about 280 degrees! The weird thing is this occurs so randomly. It was working ok for maybe 4 or 5 days and then decided to blow one night and has continued to do so at random-sometimes a couple of times a day, sometimes once a day. Well, apparently the damn relief valve had enough because this morning I woke up to what sounded like water running. I went into the basement and was greeted by water gushing and 2 inches of water in my basement. My husband turned off the water and the repairman came to check it out. The thing puzzling everyone is what the heck is causing the psi and water temp to rise so drastically from time to time? He actually installed a second expansion tank which he said is unheard of for a dinkly little boiler like ours, but it seems to be keeping down the pressure (it's hanging out at 11 psi as opposed to being in the 20's.) Anyone with any hypotheses? This is very frustrating and I'm afraid to leave my house for fear of another flood! Thanks in advance for any advice you may have.