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Boiler fluctuates between 180-215
New here looking for some help, I’ll do my best be to short but thorough in what I’m going through here.
System is a gas forced hot water system, 4 zone Taco setup
30 year old Slant Fin 100 Series w/Honeywell L8124E triple aquastat
1800sq/ft Raised Ranch house
I know it’s old, but I’d like to get through these last two months that we need heat in New England before making a decision on swapping out to a newer, more efficient system.
Out of nowhere, started hearing whooshing in my pipes and crackling fins throughout the house. Heat still works great, but there were no noises prior and I’ve been in the house about a year.
Hi/Lo is set at 180/140 yet it still climbs to about 210-215 when it finally shuts off. Pressure is always constant at 20psi regardless of temperature. Even with the Hi limit set to 160, the boiler is firing up when the temp is at 180. Should I replace the aquastat($250 gamble)? I ordered and have one sitting here but wasn’t sure if that could be it or I just have air trapped. I cracked one of the zone valves that had the river of water sound running through it and got no air spitting out, straight and steady flow of water. The noise in the pipes has lessened over time but still exists, most of the noise is an occasional bang and crackling fins but again, those are new noises.
No recent work has been done, I can’t find any leaks anywhere. I never hear the autofill adding any water to the system indicating that it is running low. I have a drop ceiling basement so any leak would be completely obvious.
All 4 zones work perfectly and get heat when called on, house stays warm but the boiler runs a lot. Gas bill was pretty high which was why I even bothered to check. Plumber friend over the phone suggested I do the expansion tank, vent, autofill and backflow to see if any of those components are creating air in the system. I’m not opposed to doing that, he’s busy and can’t get here and I’m capable of doing the work but I’m just looking for ideas and picking a direction to go.
Basically I’m wondering if I should try the new aquastat or swap out the expansion tank and other items first.
Thanks in advance.