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DIY In King George 01-07-2007 05:34 PM

Install of Replacement HW Heater
I am getting ready to install a new hot water heater. I am pretty sure I can do this project myself. The hurdle that I can't seem to resolve is that the Tempreature relief valve on the old heater is on top and is piped to the left. The temp. relief valve on the new heater is on the right side close to the top. Would the best way to replumb this be to use PEX tubing & pipe around the back of the heater?? If not, any other ideas.

Thanks for any assistance.

majakdragon 01-07-2007 05:51 PM

First question would the pipe from the T/P valve tied into a pipe exiting the area? Many are just piped down to just above floor level. T/P valve piping cannot be reduced to a smaller diameter piping. Most are 3/4" and must maintain that size to the end of the line. Sorry I cannot give you an immediate answer without knowing the situation.

DIY In King George 01-07-2007 08:05 PM

It is a 3/4" copper line that runs down into the ceiling of the basement, then over to the basement wall, down the wall & then outside...

Ron The Plumber 01-07-2007 08:48 PM

If you can solder, a few 90 and a chunk of pipe will get you to the need place, sometime you can just tighten up the T&P valve more to get it in the direction needed.

DIY In King George 01-07-2007 08:57 PM

Its not the direction of the valve, it is physically on the other side of the heater. I didn't know if the PEX pipe everyone talks about would be ok to route around & behond the heater.

Ron The Plumber 01-07-2007 08:59 PM

No, pex will cause a reduction in the line, code does not allow reduction on the pipe out of the T&P, you can use copper.

DIY In King George 01-07-2007 09:05 PM

Is the id on 3/4" PEX smaller than the id in3/4" copper???

Ron The Plumber 01-08-2007 07:49 AM

No but the fitting are.

DIY In King George 01-11-2007 07:13 PM

I finally finished the istallation. How long once power is turned on should I test water temperature? I know I have power to both elements. Biggest thing is the kids want a hot bath in their own tub tonight...

Ron The Plumber 01-11-2007 07:18 PM

About 1 hour

DIY In King George 01-11-2007 08:22 PM

OK, now I'm stumped. I have power to each element. The tank is full. Water flows fine. But water is cold as hell after about 90 min. I would think the water would feel a little warmer by now. Any ideas???

Ron The Plumber 01-11-2007 08:53 PM

You may have power but did you make sure you filled the tank up and bleed the air out of the new tank prior to powering in up?

What does the power read at the upper and lower elements?

DIY In King George 01-11-2007 09:05 PM

Yeah, I did fill it up & bleed the air out. I had water running freely from 4 different faucets before I turned on the power. I am unsure of the actual voltage at the elements. All I have at the moment is a 120v test light. The kind with 2 wires that you stick tle leads into an outlet & a orage filament glows.

Ron The Plumber 01-11-2007 09:15 PM

At 1st fire up, cold tank.

You should have 240 on the top and 120 on the bottom, you need to know this for sure, the 1st element heats before the bottom element, once the top reaches it's set temp, power to transfred to the bottom element and top element will stop heating.

You need to test the voltage at the terminals, get a volt meter.

You can power down the heater and touch the tank near the elements to see if the water really ever got hot, tank will be hot or cold to touch.

DIY In King George 01-11-2007 09:52 PM

Ok, went & picked up a meter. I have 120v at both elements. I see where there is 120v coming to both sides of the top element, but I can't seem to get a 240v reading. I also shut off power & checked continunity through each element & there is continunity. Is there a way to test for a bad element?

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