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

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Shuts down when temperature falls below 35 degrees

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1 Answer

Heat will not shut down, continues to get hotter


there might be a broken hot water pipe somewhere and so that might be causing the heater to stay on as its not getting to temperature.

Sep 26, 2016 | Water Water Heaters

1 Answer

What is snowflake symbol


shows that the setting [temperature] is set to come on when a temperature inside gets below 2 degrees or zero

Apr 10, 2015 | Lux PSD111 Digital Non-Programmable Single...

1 Answer

My water heater shuts down in cold weather. How do I fix this problem


Add tempering tank.
Tempering tank made from old tank-type water heater, or small tank heater will passively heat incoming water.
http://waterheatertimer.org/Tempering-tank.html

This works because tankless can only raise temperature so many degrees. If water is very cold, tankless cannot keep up, so the sensors shut down the unit.
Passively preheating water... or using a small tank connected to power can preheat water enough so tankless works.
Also delime tankless each year will help remove natural scale that builds up inside tankless heat exchanger.
http://waterheatertimer.org/How-to-delime-tankless-water-heater.html

Gene

Water Heater Timers Save Money

Feb 13, 2015 | Water Water Heaters

1 Answer

Why the hot water temperature couldn't reach the set temperature (130 degree) in Amtrol WHS80Z indirect water heater?


I have a couple of thoughts. You may have air in the boiler water circuit at the loop that feeds the tank. You'll have to find the vent in the loop to get it out. Second, the automatic valve that opens for hot water may not be opening fully. Have you felt both the boiler water lines that go in and out of the tank? If the water going in is hot and the line out is very cold you have very little boiler water going through the loop. Make sure the isolation valves on the loop are open. Is your boiler full of water? If the boiler loop lines are hot going in and coming out, the tank is full of rust or debris and no water can get to the fins on the internal tubing to pick up heat. If that's the case there is no repair and its time to get a new tank. Hope this helps good luck.

Nov 04, 2014 | Amtrol WHS-80Z - WHS-80Z 80Gal Hot Wtr...

1 Answer

Tankless water heater doesn't produce hot water in the winter when tempetures are below 32 degrees. I tried a water saver shower head and this worked for a little while. Anything else I can do ?


1) Tempering tank might help:
http://waterheatertimer.org/Tempering-tank.html

2) Reduce temperature setting on tankless unit so there is less differential between incoming cold water and thermostat set point.

3) Absolutely any tankless problem can be solved same day by installing tank-type gas water heater:
http://waterheatertimer.org/How-to-install-gas-water-heater.html

4) Add comment and say what you do to solve problem.

Jan 31, 2013 | Bosch AquaStar 2400ES-NG

1 Answer

How do I leave the water heater when I go away for the winter


if you leave the heating on low to stop freezing is fine . Not sure how you water works but I would leave it on to stop freezing Also get some one to pop in once a week to check things are ok .

Mar 19, 2017 | Beretta Water Heaters

1 Answer

I have a GE Profile Water Heater Model #SE40M12AA01.


I recommend safety changes to prevent ruptured water heater and assorted leaks.
135 degree hot water.
Maybe replace TP valve if it is dripping.
Drip pan under water heater with 3/4" drain line to outside.
Expansion tank on incoming cold water line to absorb pressure build-up, and prolong life of tank and plumbing.

Here's why:

1) Yes you can have scalding hot water.

2) I recommend 135 degrees since that will burn the evil right out of ya. And generally kill clothes washing bacteria.
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html

3) 150 is dangerous and can seriously burn skin in 1.5 seconds. Not safe around children and elderly.

4) Temperature settings on electric water heater are approximate, since thermostats are calibrated approximately, and read temperature through tank wall.

5) Also if you want to increase amount of hot water for high-consumption household, then setting tank temperature upward is one solution since more cold water is mixed with hot, so amount of hot inside tank goes further.

6) High temperature can cause TP valve to release water.
TP valve is pressure-temperature safety valve. Do NOT cap off.
Rating should be 125 psi and 180 degrees ... but all things water heater are approximate, and TP valves need replacement now and then.
It is not recommended by water heater manufactures to use 150 psi TP valve when water heater came with 125 psi. Rating shows in small print on end of TP. New TP valves sold at local hardware. Let tank cool before installing new one.

7) Higher temperature and high pressure can rupture tank.
Pressure over 80 psi shortens life of water heaters and plumbing fixtures. Put BTG100 pressure gauge on water heater drain valve to check pressure.

8) You need a drip pan with 3/4" drain line to outdoors, or to drain vent line, to prevent flood caused by ruptured water heater.
Turn water heater off when going on vacation.
Inspect water heater each 6 months.
Drip pan available at local home center or hardware:
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html#drip

9) Heated water expands and puts pressure on tank and pipes.
Water does not compress... so when water gets hotter it expands against tank wall and against pipes.
Especially in closed system (check valve present) when system is without expansion tank.
Expansion tank is installed on incoming cold water line.
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html#expansion

Oct 31, 2012 | Water Heaters

1 Answer

How do I turn up the water temperature on a Marathon 85 gallon electric water heater? I don't see any visible temperature control settings.


The temperature is controlled on the thermostats in the tank. They are under the two covers you see on the outside of the tank. There is an upper and lower thermostat. Make sure you shut off the power before you begin. Remove the cover and peel back the insulation covering the thermostat. Use a flat head screwdriver to adjust temp. There should be a pointer showing the temp its on now. They are probably set at 120 degrees. WARNING--turning your hot water temp above this point can cause scalding and burning in less than 3 seconds. You may have a burnt out lower element. This link below should help you

http://globalimageserver.com/fetchDocument.aspx?id=574f6c2f-32c1-4c28-824c-172bbbfe5578

This is the manual to your tank. Good luck.

Apr 23, 2011 | Rheem MSR50245 Marathon Electric Water...

1 Answer

I have a Vangaurd 6E720 30 gal electric hot water heater and the water does not get very warm.


If this is a new installation, make sure the unit is feed with at least 208+ volts of electricity.
If it is an older tank, try turning up the temperature setting on both thermostats. Set the top one 10 degrees higher than the bottom. If there is now change in the water temperature after a day or two, replace both thermostats. While your at it, change both element as well. A complete universal electric water heater rebuild kit should only cost around $35.

Aug 28, 2010 | Vanguard International Vanguard BY Rheem...

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