How To Adjust Temperature On Rinnai Tankless Water Heaters


Hot water can be dangerous for babies, children, elderly people, and those recovering from surgery. You should not set the thermostat too high to increase the risk of hot water scalding. Are you interested in learning how to adjust temperature on rinnai tankless water heaters? First, remove the front panel. This will expose the “guts” of the Rinnai tankless water heater.

How To Adjust Temperature On Rinnai Tankless Water Heaters

It is frustrating to install a tankless water heater and find out that it is not hot enough for your household. Some homeowners do not realize that Rinnai heaters have a 120F default temperature. You can increase the default temperature of Rinnai tankless water heaters by following a few easy steps. Most Rinnai tankless water heaters can reach 140F.

First, remove the front panel from the heater to adjust the Rinnai’s temperature. Most Rinnai tankless heaters are adjustable by flipping a dip button. Dip switches are small, series switches on the circuit board. Some Rinnai units might have a different button procedure than a dip switch. This guide will focus on Rinnai V53DE tankless water heating heaters, but you can use the same general procedures for other units. The installation manual will provide the precise settings for your Rinnai heater.

Step 1

You must have the power to adjust the default temperature of a Rinnai unit’s thermostat. The purpose of this task is to modify a dip switch and press buttons on the unit. Therefore, the power must be turned on.

Step 2

To change the default maximum temperature of a Rinnai tankless heater, you must first remove the front panel. You can remove the two sections of plastic trim from each side. After the trim pieces have been removed, the screws can be exposed. Remove the four screws with an electric drill or a screwdriver. Remove the front panel carefully.

Step 3

The priority button must be glowing green. If it is not, click the priority button. Look at the dip switch in the Rinnai tankless heat exchanger. These are tiny switches that are connected to a circuit board. A Rinnai tankless heater with a temperature controller (up/down buttons to adjust the temperature) has a specific switch that you can flip.

You will need to flip switch #6 on the dip switch SW1 to adjust the max temp to 140F instead of 120F. The row of tan-coloured switches in the heater is called the dip switch SW1. Flip switch #6. The temperature control on your Rinnai tankless heater will not be available if it does not have one. There will only be two settings: the default 120F and maximum 140F. You will need to flip switch #5 in the SW1 dip switches (tan-coloured) to change the temperature to 140F.

Step 4

To check if the temperature controller is working, press the up arrow. You can also open a faucet to test if the temperature is higher if your thermostat does not work. Once you have verified that the temperature settings have changed, you can install the front panel. Put the screws back in and slide the plastic trim pieces on the sides.

How do I turn the water heater up to a higher temperature

Your water heater’s make and model will determine the exact method for adjusting its temperature. The basic principles of controlling the temperature of water heaters are the same. All new gas and electric water heaters come with an installed thermostat at their back. The electric water heaters come with two thermostats. One at the bottom and one at the top. These thermostats come with a digital display that will show you the current temperature and other controls.

All water heaters have a recommended temperature range that can adjust. The Department of Energy recommends keeping your water heater at 120 degrees F or 49 degrees Celsius. This temperature is ideal for maintaining energy efficiency, killing disease-causing pathogens, and preventing scalding. The water heater can support a small family if it is set to 120 degrees F.

Why is hot water dangerous

  • Only three seconds of exposure to 140F degrees
  • Eight minutes of exposure at 120F
  • When water at 130F degrees is touched to the skin for 20 seconds, it can cause skin burns.

When hot water is used with children, safety should not be compromised. You should, for example, always check the temperature of the water before you bathe or shower a child. It would help if you also supervised any child or infirm who is using the bath. Before you bathe a newborn baby or child, make sure to check the temperature.

Are adjustments different when using controllers

Some models need an older controller (MC-45), and you will need to move dip switch No.6 from the bank of 6 dip buttons, so it is ON. Temperature settings can vary. You can also get Rinnai units with a maximum temperature of 120F or increase it to 140F. The temperature settings range from 125 to 140F degrees. You can adjust dip switch 6 to ON within the SW1 bank with 8 dip switches. To maintain a temperature of 140F, a mixing valve is required.

These are the ideal temperatures for your home:

  • Shower- 98-110F degrees
  • Bath fill- 102-110F degrees
  • Kitchen -120F degrees

You can also change from Celsius to Fahrenheit and vice versa. You need to hold down the “On/Off” button for five seconds. Make sure the water heater is off. An MCC-91 controller is available on some Rinnai units. The connected controller makes it easy to achieve high temperatures. The MCC-91 can use for both commercial and hydronic purposes. Suppose you intend to use the MCC-91 for Hydronics applications in residential homes. In that case, you will need to install a mixing device to set the desired temperature for potable hot water.

How to adjust the temperature on Rinnai tankless water heaters: Tips

You need to know the following important points regarding your Rinnai tankless heater temperature settings.

  • You can set the temperature of your water heater unit to 98F or 110F degrees, depending on whether it is producing hot water.
  • The Rinnai tankless water heating system must be used in commercial settings. You should review the recommended codes to set the temperature. It may not be permissible to set the temperature to 120F, as you would typically do for residential use.
  • Rinnai water heater units that are operated remotely will have default settings of 104F degrees.
  • Water temperature will be determined by the distance between the heating source, the taps and the faucets. You can fix the problem by installing circulating pipes to prevent heat from escaping.
  • The water heater might not be able to heat the water if you use a mixer or tap simultaneously.

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