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I have excessive expansion noise in mt wall heater, how do i fix it?

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Here is an old school trick. As long as the heat exchanger is in good shape, get a hammer and put a dent or two in the heat exchanger and it will quiet it down considerable.

Posted on Feb 06, 2010

  • Frankfurt Feb 15, 2012

    Which part is the heat exchanger?



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My Rinnai Tropic wall unit heater makes noises after the thermostat cuts off the heat and it's cooling down. Then it makes a loud clang sound. What's goin on please?

Jack some of this normal due to thermal expansion and contraction. If you installed it, you should check all the fasteners and make sure they are tight.

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The unit uses oil to create residual heat. The oil can contain small amounts of moisture and when the unit heats that moisture turns to steam, Steam has a great expansion ratio. When the steam condenses back to moisture it can conglomerate into large water droplets instead of being dispersed. This means that when it heats back up the steam expansion is more radical and makes noise. Unless the unit starts leaking oil, it is fine to continue using it.

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Can anyone fix the ticking and banging expansion noise when first turned on and after it goes off?

Not really much you can do about it. With time it stresses itself out. However, if you're using the the blower, it should continue automatically to run, until the heater cools down some. That should ease some of the noise from metal expansion. The other thing to consider is whether the flame height is to tall? This would cause it heat up more than it should. Also, make sure nothing is obstructing the intake air flow (air that's taken in from the house, heated and sent back out).

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1 Answer

I had this heater installed in December. I makes a lot of banging noises when it first goes on and then after is shuts off. I called the dealer and he said they all do that. My friend has the same...

It's the expansion and contraction for the metal inside the heater, that's causing this noise. Sometimes, it's an indication that the heater was not properly attached to the wall or some of the metal parts inside the heater are slightly loose. Generally, in time, this metal stressing will stop, once it's peaked. However, I would not accept "they all do that", as an excuse. Check your Owners Manual for the Trouble Shooting Guide. This should provide some more insight into the issue.

Hope this helps to solve your noisy problem.

Feb 27, 2011 | Williams (5009622) Ceramic Gas Wall...

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My cozy furnace makes a loud clicking noise every time it is running. What can I do to fix this problem?

Wall furnaces sometimes do that it is just expansion and conttraction of furnace. rus

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If the noise is not coming from the fan as Buffalo suggests, it is most likely the expansion and contraction of the heat exchanger. The old school way to lessen the noise of expansion is to bank the combustion chamber with a hammer. I don't recommend it today because the metal is so thin (thus all the noise) and you may damage it. You will get used to it and the noise may soften the more it is used. You will never get it to stop.

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2000 watt baseboard heater is making loud clicking noise

Most base board heaters installation instructions say to attach to the wall with screws which are slack ( not fully tightened) in order to allow the heater case to expand and contract otherwise you get a clicking noise

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