Question about Powerstream RP1P Electric Tankless Water Heater, 208/240V

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My tankless RP1P is not heating well the water and is already set at Hi Temperature. What can be done to fix it?

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Follow this steps and fix it. God bless you
Test and replace a heating element:

  1. Turn off power at the electrical service panel and post a sign warning others not to turn it on.
  2. Remove the access panel on the electric water heater.
  3. Disconnect one of the element wires and set a multimeter to RX1000 (resistance times 1,000). Touch one probe to an element mounting bolt and the other to each element terminal screw, in turn. If the tester displays anything but infinity ( open circuit), replace the element.
  4. If necessary, set the multimeter to RX1 and touch the probes to the terminal screws. If there is any resistance reading at all ( closed circuit), then the element is good. If not, replace it. Both upper and lower elements are tested in the same manner.
  5. To remove the element, first drain the heater.
  6. Disconnect the remaining element wire. Remove the mounting bolts holding the element in place. Remove the element.
  7. Replace the heating element with one of the same model, shape, and rating. Make sure you also replace any installation gaskets.

Posted on Oct 21, 2013

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How long do tankless water heaters last?


if the tank is stainless steel it should last 30 years or more however most are not and if they last 10 years it still is not cost effective since they cost so much more than conventional

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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

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I have a Paloma PTG-74PVN-1 high volume tankless water heater installed in 2007. Recently, I am having hot water temperature problem, no error code is displayed, but it can not heat the hot water beyoun...


Even though you are not getting an error code, there are may be some diagnostics in the controller that can identify whether it's an electronic (controller/sensor) or a heat exchanger issue. I would contact Rheem tier-2 support.

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Hot water varies


I do not know how old this unit is or what model but many water heaters are not sophisticated enough to measure the temperature, but heat based on water flow and temperature rise. To start, tankless water heaters turn off every time you turn the hot water off. Lets use an example. You use the facilities, wash your hands then turned off the water and take a shower. You will bring the already heated water (from washing your hands) from the pipe up to the shower. Then the cold water that comes into the pipe from the reactivation of the water heater comes up the hot water pipe with warm then hot water just behind.

If this is not your problem, keep reading. Every unit I have been called to see were installed wrong. Check your installation manual to see if the problem with the system started with the contractor.

First, check the temperature of the water from the heater. If it is too hot and you are mixing too much cold water in, the unit will turn off because there is not enough water flow to keep it running.

Second, turn off the valve at the water heater and turn on the hot water at a faucet. If the water does not stop running, there is a "plumbing cross over" usually caused by a failing pressure balance valve in a shower.

Third, if the unit has not been serviced, go to bosch-climate.us to find a tankless water heating professional in your area. Totally Tankless LLC

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1 Answer

Raise temp above 120


Raising temperature above 120 degrees requires service call.
Or change dip switch settings and risk voiding warranty and causing service call expense.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#temperature

Earliest versions of Rheem tankless 2006-8 let you set temperature up to 140 degrees F using remote.
However the hotter setting caused error codes because the burner cannot keep up with both high temperature and large volume of hot water rushing through pipe. Especially in winter with cooler incoming water that must be heated more to reach temperature set point.
The burner simply cannot keep up.
So Rheem changed maximum temperature at remote control to tepid 120 degrees, which is not hot enough for folks wanting hot shower, or folks filling whirlpool tub because water in tub cools before tub fills.

Oct 27, 2012 | Rheem Tankless Water Heater Main Remote...

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Error c4-15 what does that mean


Before calling service technician, copy following link for troubleshoot resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

C4 can range from failed PC Board to lime build-up inside heat exchanger
Error 15 is 'heat exchanger is too hot', clogged heat exchanger, restriction in cold water inlet, temperature set point too high.
If you recently changed temperature setting, then that might be cause.
Tankless require monthy-to-yearly maintenance to avoid common error codes.
Delime tankless and clean water filter, keep temperature low.
Never install tankless water heater is best way to avoid complications of expensive water heater that is maintenance heavy, hard to diagnose, expensive to fix, etc.
Never expose tankless to more than 11 grains hard water.
http://waterheatertimer.org/pdf/Rheem-CondensingTankless-maintenance-2012.pdf
http://waterheatertimer.org/pdf/Rheem-De-lime-tankless.pdf

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1 Answer

Rheem rte13 standby (green) light not on


You might have crossover problem caused by bad faucet cartridge.
http://waterheatertimer.org/Crossover.html

The green standby light should come on when 240Volt power is applied. Page 6 manual.
Both red lights should come on when tankless is activated. Page 6 manual

RTE 13 requires 60 amp breaker and 6 gauge wire
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html
http://waterheatertimer.org/pdf/Rheem-TanklessElectricUC_AP15447.pdf

Factory temperature setting is usually default 120 degrees.
Adjust temps page 11 manual
Thermostat calibration is always approximate.
120 degrees is not hot enough to burn the skin.
Exceptionally cold incoming water temperature can cause tankless not to heat enough hot water: install tempering tank to preheat water to room temperature.
Tankless cannot be exposed to more than 11 grains hardness in water. Delime tankless yearly, clean water filter monthly, do not install low-flow restrictions or conserve water since the flow rate must remain high for tankless to activate.
Rheem does not post service manuals for their tankless water heaters.
Call Rheem 800 432-8373

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I have model AH21 Tankless Water Heater and it is not heating the water


try these steps - hope it helps
  • Selected temperature on your tankless water heater is too high. Select the lower temperature.
  • Inlet filter is dirty... clean it.
  • Make sure that there are no water path obstructions, including faucet aerators, shower heads...
  • Is the heater using the specified gas type?
  • Temperature sensors are loose... ensure that sensors are firmly mounted and are making contacts.

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1 Answer

Recently purchassed system from you plumber installed it and we asked specifically not to set it on child settings.....we have not had one HOT shower since. how do we go about resetting the hot water...


These Tankless water heaters attempt to heat water as it quickly travels through a short series of heated copper pipes. A high volume of water at an accelerated speed has little time to heat up as it passes through its heating source. You can turn up the temperature (which you undoubtably tried) and turn the water volume all the way down. These settings will produce the hottest temperature capable of the unit - given the entry temperature of your water source.
Most underground water enters at app 52 degrees - and becomes even colder due to ambient temperatures. Difficult to raise this temperature 60-70 degrees in a few seconds of heating.
I've routed a series of copper pipes adjesent to the home heating system in an attempt to pre-heat incomming water. It's only a few degrees warmer, but results a 20- 30 degree hotter delivery.
I have installed some top end units that simply delivers Hot water without compermise.

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