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Old 11-10-2012, 07:56 PM   #31
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Posts: 3,193
Originally Posted by btxlr View Post
We just filled our 395amp FW tank, and for the past 20 minutes water has been running out of a blue rubber hose under the middle of the unit that has no fittings or valve... as much water as we've put in has run out. It isn't the low point drain- what IS it? The service mgr at the dealership couldn't identify it over the phone. We understand there is an overflow valve, but how long/how much should run out if that's what it is?

Also, our water pump (which will be replaced) is sending only cold pressurized water to our bathroom, and no water at all to the kitchen. Is this strictly a pump issue? The hot water tank is fired up and full but no water is getting out.

We are in a snowy area, but we have the underbelly skirted/insulated, and tank heater has been on.


Brian & Terri
Ok back to the subject the "blue tube" sticiking down is probably 3/4" pex tubing, like all the other piping on the unit but larger. It is probably covered in screen to keep critters out and secured to the tubing In my unit and many others it simply exits the top of the tank and immediatlely makes a 180 deg. turn and down. If the unit is off level or the tank is off level the water reaches the vent early and fills. Only 6" higher than the water a siphon starts the the water starts to leave the tank, there is no other openings to stop the vacuum. I've seen here in this forum, many people install a valve to stop the overflow early duing the transit and then open at the destination. A much better way to do it is to raise the 180 at least a couple of feet fitted with a vacuum break valve (avail in major and smaller hardware stores. Then you could fill and overflow safely and end the tank shortage. The vent does not have to go straight up. You can find a closet or hollow wall nearby route over to that space then insall your 180. The anti syphon valve will not let flow into its occupied space it simplly will not allow the line to go under vaccum. The the tank 1/2 full the water can slosh to the vent, fill it and start the syphon effect untill it sloshes back. If you decide to plug you must remove the plug to use the pump system, tank damage will result otherwise.

As for the hot water, some systems have three valves 1. cold water into heater, 2. Hot water from heater and the bypass valve you are familiar with. For service 1 and 2 open and bypass shut, for winter 1 and 2 closed and bypass open.

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