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Boiler Noise?

JackLance Member Posts: 2
Hi all, i`m new to this forum and I've got gas heating boilers, that's being heated with a perless 110k btu boiler. Residential. Anyway there's a humming or vibration coming from the tank that gets louder as the water heats up and gets more noisy when i turn the speed of the pump up and less noisy when i turn the speed of the pump down. I've tested for a hole in the heat exchanger buy draining the tank and running the boiler on the call the tank put off with no water in it, with the drain on the bottom of the tank open to see if my boiler water would heat up opening the crack in the heat exchanger and shoot water into my tank. but all we did was heat up the remain tank water at the bottom and it spilled out the drain. Any suggestions on what the noise is or how i can find out?
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