Electric Water Heaters FAQ

Tronic 3000 US3/6/7/9/12, RP1P/2P/3P/7P/9P/12PT, and AE3.4/7.2/9.5 Tankless Water Heaters

The temperature of the hot water that it produces will be affected by:

1. The model that you have installed. We offer a range of point of use electric tankless water heaters, and the heating capacity will vary between the models.

2. The temperature setting that you have selected. Depending on the model installed you will have either a circuit board with a temperature knob on it, or a mechanical flow switch that has a screw that can be loosened and slid to either "LO" or "HI".

Before removing the front cover to make adjustments, please isolate the water heater from the power supply by turning off the correct circuit breaker inside your breaker panel!

3. The flow rate of the hot water fixture that you are feeding from the water heater. In a tankless water heater the cold supply water is heated as it flows through the heating coil, and so the faster the water moves the less heat energy that it will be able to absorb from the heating elements.

If you have selected the highest available temperature setting but the output water temperature is too low for you, then you will need to reduce the water flow rate to allow more heat energy to get into the water before it leaves the water heater.

If your water flow needs are too high for the model that you have installed, you may need to consider a model that has a higher heating capacity.

4. Supply voltage. Each model has an electrical installation requirement that must be met, and if the supply voltage is less than the model requires this can result in a reduced heating capacity.

Example; The Bosch Tronic 3000 US9 model is rated for 240vac. It will work down to 208vac but will lose approximately 25% of its ability to heat the water.

For full performance capabilities and further information on adjusting the temperature, please refer to your product manual.

If you no longer have the manual, you can download a copy from this page

For Models With A Circuit Board (US12, RP12P, AE12):

1. Isolate the water heater from the power supply by turning off the correct circuit breaker in your breaker panel.

2. Remove the front cover of the water heater.

3. Look for the tall plastic knob that is on the circuit board. Adjust it as needed.

4. Replace the front cover, turn the circuit breaker back on, test the water temperature.

For All Other Models:

1. Isolate the water heater from the power supply by turning off the correct circuit breaker in your breaker panel.

2. Remove the front cover of the water heater.

3. Look for the mechanical flow switch, and you will see a small screw next to a "LO" and "HI" sticker.

4. Loosen the screw enough to be able to slide it to either "LO" or "HI" as desired. Retighten the screw.

a. "HI" setting will use both internal heating elements to heat the water, offering full power.

b. "LO" setting will use only one heating element to heat the water, resulting in 50% power.

c. You must slide the screw fully to either "LO" or "HI", the water heater may not operate correctly if the screw is set in between the two settings.

5. Replace the front cover, turn the circuit breaker back on, test the water temperature.

Note: If you have selected the highest temperature setting for your water heater, and your voltage supply is correct for that model, then you will need to slow the water flow rate down in order to gain a higher output water temperature.

For full performance capabilities and further information on adjusting the temperature, please refer to your product manual.

If you no longer have the manual, you can download a copy from this page

These are the most common causes for failure to activate with water flow:

1. No power. Please check that the electrical installation is correct for the specific model and that adequate power is being supplied to the water heater.

2. Water flow rate. Each model requires a certain minimum GPM (gallons per minute) water flow through it to activate the internal flow switch. If you have verified that correct power is being supplied to the water heater then it may be the case that your hot water fixture is only allowing a flow rate that is below the minimum needed to activate the water heater. If you can speed the water up to be above the activation rate, the water heater should turn on.

For minimum flow rate requirements, please refer to your product manual.

If you no longer have the manual, you can download a copy from this page; LINK

3. The internal thermal cutout safety device may have tripped. Your water heater contains a safety device that senses the temperature of the copper heating coil, and if an overheating condition occurs this device will trip and prevent power from reaching the flow switch.

To reset the thermal cutout switch:

a. Isolate the water heater from the power supply by turning off the correct circuit breaker in your breaker panel.

b. Remove the front cover of the water heater.

c. Locate the thermal cutout device and press the small button that is in the middle of it. If it clicks in, then the device was tripped.

d. Replace the front cover, turn the circuit breaker back on, test that the water heater now turns on when water is flowing.

For further information, please refer to your product manual.

If you no longer have the manual, you can download a copy from this page

No, this water heater is designed and approved to be hard-wired only and must NOT be plugged in to an electrical outlet.

Note: If the water heater is installed in a location that is out of the sight of the breaker panel that is supplying it with power, a circuit breaker lockout or additional local means of disconnection for all non-grounded conductors must be provided that is within sight of the appliance. (REF NEC 422.31).

For full installation requirements, please refer to your product manual.

If you no longer have the manual, you can download a copy from this page

No, this water heater is designed and approved to be supplied with unheated potable water only.

If you are in need of a small water heater that can be used in a booster application, please take a look at our Bosch Tronic 3000T range of mini-tank electric water heaters instead!

Yes:

1. We highly recommend that you use water shut-off valves when installing the water heater. This can help with adjusting the maximum water flow rate through the water heater if you need to increase the temperature of the hot water that it produces.

2. Never use pipe dope to seal the water connections, as it can lead to damage to the flow switch and internal heating elements. Use only teflon tape to seal the connections.

3. Try to keep the pipe as short as possible between the water heater and the hot water fixture that it is supplying. This will minimize the wait time for hot water to arrive at the faucet.

4. Check valves or any other types of backflow preventer must not be installed within 6ft of the cold water inlet connection.

5. Do not use PEX or PVC piping materials to or from the water heater. We recommend either rigid copper piping or stainless steel flexible piping.

6. Never supply this water heater with pre-heated water. It must be supplied with unheated potable water only.

For full installation requirements, please refer to your product manual.

If you no longer have the manual, you can download a copy from this page

In the event of a water leak:

1. The very first thing that you should do is Isolate the water heater from the power supply by turning off the correct circuit breaker in your breaker panel.

2. Next, turn off the water supply to the water heater. If the water is leaking from inside the water heater, skip to Step 4.

3. If the water is leaking from where plumbing is connected to the water heater:

a. Remove the pipe and inspect it for damage.

b. Inspect the water connection nipples on the water heater for damage.

c. If no damage is evident, wipe clean all water connection surfaces and reconnect the piping to the water heater. If a threaded connection was used, reapply teflon tape to the water heater's threaded connections prior to screwing the pipe fitting back on.

d. Once the plumbing is reconnected, open up water supply to the water heater and check that the leak has stopped.

4. If the water is leaking from where the internal mechanical flow switch is plumbed into an internal copper pipe:

a. Unscrew the two small fittings.

b. Ensure that they are clean and undamaged.

c. Screw them back into place.

d. Open up the water supply to the water heater and check that the leak has stopped.

e. If the leak has not stopped it may be necessary to replace the whole flow switch assembly.

5. If the water is leaking from the body of the internal mechanical flow switch:

a. A new flow switch will be needed.

6. If the water is leaking from the internal copper coil pipe:

a. The water heater must be replaced.

Note: Do not turn the electrical supply to the water back on until any water leaking has been rectified.

For further details and the parts list, please refer to your product manual.

If you no longer have the manual, you can download a copy from this page

No, this water heater contains no parts that require regular maintenance.

Tronic 3000 US3/US3-2R, Powerstream RP3P, and Powerstar AE3.4 Models;

120vac - 30A Single Pole Breaker - 10AWG (minimum) Wire Size.

Tronic 3000 US4-2R Model;

240vac - 20A Double Pole Breaker - 10AWG (minimum) Wire Size.

Tronic 3000 US6, Powerstream RP2P Models;

277vac - 25A Single Pole Breaker - 10AWG (minimum) Wire Size.

Tronic 3000 US7/US7-2R, Powerstream RP7P, and Powerstar AE7.2 Models;

240vac - 30A Double Pole Breaker - 10AWG (minimum) Wire Size.

Tronic 3000 US9/US9-2R, Powerstream RP1P, and Powerstar AE9.5 Models;

240vac - 40A Double Pole Breaker - 8AWG (minimum) Wire Size.

Powerstream RP9P Model;

277vac - 35A Single Pole Breaker - 8AWG (minimum) Wire Size.

Tronic 3000 US12, Powerstream RP12P, and Powerstar AE12 Models;

240vac - 50A Double Pole Breaker - 6AWG (minimum) Wire Size.

For further details and the parts list, please refer to your product manual.

If you no longer have the manual, you can download a copy from this page