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Creeping pressure on boiler
Hi fellow contractors! I've been at his p&h business over 30 yrs. Got a Vaillant 80% eff. 25yr. old boiler driving me crazy. New #30 amtrol exp. tank and new pressure reducing valve still get pressure creeping up to relief valve leakage. Boiler sounds a bit limed up when it gets to temp. about 170-180. Exp. tank hooked to bottom of air scoop and has clear passage thru. I even put an additional #30 tank on return side off boiler drain just to try SOMETHING. Worked for 2 wks. got a call again relief leaking. House is only 1600sqft. ranch. Also has 40 gal indirect fired water heater. What am I missing here? Is it the liming up? Even with 2 tanks? I appreciate anyones input.
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