Question about Rheem Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm

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No hot water after installation and powering up

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All water valves open? Unit will flow approx 3/4 gallon prior to starting. If flow is good, check the flow switch to see if it is closing. If flow switch is closing and unit still not firing, assuming gas pressure is good; Nat 3.5''w.c., LP 10" w.c., loose wiring at board, ignitor. Sounds like something simple overlooked.

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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test the thermostat and the heating elements --also there are resets that can pop push and make sure they have reset

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It is leaking out of the top. not out of the hot or cold valves but out of a nut by the cold side.


Your tank is rusted out and needs to be replaced.
Link below is a troubleshoot for leaking water heater.
http://waterheatertimer.org/Leaking-water-heater.html

Protect yourself first:
If your tank is rusted, there is danger of rupture.
My friend welded his leaking tank, but he assumes the risk.
Ruptured tank can cause massive damage and water runs until it is shut off.

Hot water tank is under pressure because hot water expands and pushes against tank wall.
Turn off water to tank.
Turn off power supply:
Electric: turn off circuit breaker.
Gas: rotate knob to pilot so pilot stays lit but burner will not fire. To turn back on, rotate knob to ON.
Open hot side bathtub valve and relieve pressure on tank.

You can limp by with rusted tank by turning water heater on when hot water is needed.
Shower uses 5-9 gallons hot water
Bath uses 12-15 gallon hot water
Ordinary gas heater makes 41 gallons hot water per hour
Ordinary electric heater makes 20 gallons hot water per hour.

I buy water heaters at Lowes, Home Depot, Ace.
Look for scratch and dent models.
Buy drip pan for water heater.
Wrap electric heater totally with insulation except TP valve.
Buy new flexible connectors for water lines.
Offer 15% less than marked price on tank, because the store makes money on additional items.

> Most people can install their own electric heater since you just connect water pipes and electric wire, and it's done. Read link below since there are tips that help you buy and install electric.
> Generally people are nervous about installing gas water heater, so step-by-step instructions are shown on link below. Remember gas line is under less pressure than water line, so if you can install a water pipe, you can install gas line to water heater with crescent wrench, and soapy water to check for leaks.
How to install gas water heater:
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, fixya expert speaks with you over phone while you work on water heater, or any do-it-yourself project.

Jan 13, 2011 | Water Heaters

1 Answer

We just installed a brand new Reliance electric water heater and there is no hot water or power.....tried the breaker.....help! Please!


what knowledge of electricity do you have? a hot water heater requires a 2 pole feed meaning you need a 3 wire 30 amp rated wire and it has to be on a 2 pole 30 amp breaker. first off do you have that currently installed?

Dec 18, 2010 | RELIANCE ELECTRIC WATER HEATER

1 Answer

Rheem RHEEM 50 GAL ELEC TALL Water Heater 1.5 yrs old, power at the elements, new elements installed new thermostat installed, still no hot water.


Hello Check the red overtemp reset button at the temp control.Check for contintuity at the elements with a volt meter (pull one wire off first) they should have a reading otherwise they are open & shot.Last is overdrawing (busted pipe) shut off the cold water supply for a 1/2 hour and open it back up and feel the hot water supply pipe.Is it hot?The tank can't keep up with the demand.

Sep 16, 2010 | Rheem 50 GAL ELEC TALL Water Heater 6YR SC...

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No hot water


I am afraid that you have burned the heating element out or an inline fuse is burned out

May 15, 2010 | Rheem 30 GAL ELEC SHORT Water Heater 6YR...

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Hot water heater


Absolutely no hot water indicates the top element or thermostat on the heater. Check to make sure that you have 240 volts on the top two terminals of the top thermostat. If you do then check the top element for voltage. It should also read 240 volts between the two screws. If you have 240 volts there shut off the power, drain the heater to a point below the top element and change the top element. When the element is installed turn your WATER back on and let the air bleed out of several hot faucets in the house. When the faucets stop spitting air you can turn them off. Check for leaks around the element. If you have no leaks turn the power back on the the heater and replace the covers.

That should get you 'back in hot water' in two hours.

Mike

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Instant hot water dispenser does not heat water.


I had the exact same problem. I even replaced the first unit with a second unit...because I was sure I hooked everything up correctly. Then I called their support line and and felt very stupid. They asked one question "are you plugging in the Quick&Hot into the same electrical outlet as the garbage disposal"?. I said yes..and the garbage disposal works fine (thinking that this indicates a good electrical outlet). She then said "That outlet works off of a switch so no electricity is getting to the Quick&Hot until the disposal is turned on). Gosh darn it...that made total sense. I then tested this out by plugging an extension cord into a different outlet and it worked fine. Boy...do I feel stupid. Hope this helps.

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