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Old 12-21-2008, 06:18 PM   #1
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drain freezing from high efficeincy furnance


I have a manufactured home that we use on our lake place. When we are not there we leave the heat on (low 50*) to prevent damage to the sheet rock and so we don't have to winterize the house all the time etc.

The problem I am having is the main sewer drain freezes from the high efficiency draining into it.

There is about 20 feet of drain that runs underneath the trailer before going into the ground. I was going to wrap it with heat tape then insulate, but when I went to the home center to pick up the heat tape it said not to be used on drain lines. Do they make a special heat tape for drain lines? If I did wrap heat tape and insulate the pipe would it just cause the problem to go further down in the pipe (under ground)?

Any thoughts on how to thaw/clear the blockage, (currently use a torpedo type heater blowing under the trailer, but that sometimes takes all weekend). Would I be able to clear the blockage with a drain auger?

We use the home year round, but may not be there for two or three weeks at a time.

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Old 12-21-2008, 06:58 PM   #2
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drain freezing from high efficeincy furnance


I don't know since I live in Houston but what would boiling pot of water and pouring it down the drain do?

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Old 12-21-2008, 07:04 PM   #3
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drain freezing from high efficeincy furnance


Nope, it wouldn't get anywhere near the clog, the water backs up into one of the tubs in the house. If we lived there full time I don't think it would be a problem (water running from other sources would prevent the drip, drip drip freeze from the furnace).
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Old 12-21-2008, 08:20 PM   #4
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drain freezing from high efficeincy furnance


Can you re-route the furnace drain in a conditioned or semi conditioned space so it has a direct drain to where it goes underground?

Put some rock salt directly in the furnace drain pan if it's plastic, the salt water will raise the freezing point of water? That will probably cause other problems so you may not want to try it. If the drain runs close to the bottom of the house use plastic stapled to the bottom of the house so heat from the house keeps the temp higher and wrap the drain?

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Old 12-21-2008, 08:26 PM   #5
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drain freezing from high efficeincy furnance


Unfortunately that is not an option. The manufactured home was definitely not designed with the northern states in mind.
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