How to install the electric tankless heater step by step procedure

Steps on How you may  install an electric tankless water heater

A tankless water heater has received attention over the years in most facilities and homes. This type of heater, when installed, heats water directly without the need for a tank. Cold water passes through the heater and comes out hot. You will enjoy a continuous supply of hot water in your facility if you choose this water heater. On the other hand, installing it needs you to be exclusively careful since it requires professional installation in most cases.

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Do you want to know how you may install this system in your house all by yourself? Follow through the article, and you will learn what you need and how to install the device successfully. Since it may pose a significant danger if wrongly installed, the tankless water heater requires you to follow every step with great commitment. Most cities need you to have a permit to install this device. The authorities will continuously inspect the heater for your safety if your city requirements get to this level. If not, this means that it can be quite a dangerous device if wrongly installed as much as it’s helpful and essential. You will need to follow the instructions to the latter.

Requirements to install the electric tankless water heater

You will need to meet specific requirements in your home to install this device. Most modern houses may have the desired conditions for installing the heater, while the ancient houses will need a few upgrades. You will need to meet:

  • The electric requirements- your facility needs to have the amp draw that can accommodate the electric device system. The amp draw needs to high since the device has a high voltage requirement. This voltage will allow your device to work and operate. Most of these devices require up to three 50 A pole breakers and the main service of 300 A.

Most facilities have a 200A average electric capacity. You will need to ensure that your amp draw gets upgraded to accommodate this electric tankless water heater. Even the smaller devices will require

At least two 50 A double pole breakers with the main service will bring at least 150 A. These conditions mean that an upgrade will do you good. Upgrading makes your facilities accommodate the electrical requirement of the heater system. To know if you need a new electric service, check the configurations of your electrical breaker box. If you don’t find a label, contact your electrician for details. This labeling has the electrical capacity reading for your electrical service.

  • Water pressure- you need to ensure that your water pressure reads between 30 and 150 psi for proper machine functioning. If the pressure exceeds 150 psi, you will need to install a pressure-reducing valve above the heater.
  • Ideal installation space- you will have to check for the perfect place to install this device. The site of choice has to be close to where most water gets used from and close to the cold water mainline. If your point of usage gets closer to the installed heater, you will get hot water to the outlet faster.

The location should offer clearance for servicing purposes while the installation runs vertically to the power supply.

The location has to keep the water heater free from water and other liquid splashes. The environment should not be freezing too. Consider places with excess moisture and humidity as the heater placement locations.


Tools and supplies you need for the installation

To effectively install your electric tankless heater, you will need to assemble the following tools and supplies.


  • Drill and drill bits
  • Philips screwdriver(head)
  • Flat-head screwdriver
  • Pliers(needle nose)
  • Pipe cutter
  • Adjustable wrench
  • Tape measure
  • Pencil


  • Heater’s system mounting anchors and screws
  • Half to three-quarter piping- you may chose copper or stainless steel flex pipes.
  • Pressure reducing valve
  • Shut-off valves
  • Pressure and temperature relief valves
  • Sandpaper
  • Teflon tape
  • Double pole circuit breakers
  • Pipe insulation
  • Re-circulation pump and a cross over valve
  • Wire

How to install the electric tankless heater step by step procedure

  1. Turn off all involved circuit breakers
  2. Turn off the main water supply
  3. If you had a previous heater, disconnect and drain it
  4. Take the unit you want to install and remove the screws securing the top cover of the device. Remove the top cover taking care as you might need to remove a plug or two before you completely take it out.
  5. Use the screws and anchors to mount the tankless water heater to the wall.
  6. Establish the cold and hot water connections. This connection will need you to use the stainless steel flex pipe with the Teflon tape. You may choose to use the copper pipe but ensure it has a high-temperature application rating. The cold side usually gets to the right while the hot to the left. If your cold water inlet has a filter screen, the connection to the cold water side has to enable easy removal for regular cleaning of the filter. Solder the pipes and flush them before connecting them to the heater. Avoid excess temperatures since they may damage the device as well.
  7. Install a shut-off valve before and after the heater. This shut-off will allow you to cut off the water supply to the device during routine maintenance. You won’t have to cut off the water supply for the whole facility.
  8. Install the pressure reducing valve on the cold water inlet to prevent high-pressured water into the heater.
  9. Open the water outlets in the house to remove any air from the pipes or heater. Check for leaks in the connections while at this. You may then close all outlets.
  10. Wire the heater to the electrical panel now by referring to the wiring diagram on the user manual. Choose the correct wires, circuit breakers, and wire size as referred to in the manual. Small units will need the single circuits with 6/2 AWG wire with the ground protected using the 50 A double pole breaker. The larger companies will take more circuits with thicker wiring. Fit the correct length wire to the water heater housing holes and then firmly attach them to the terminal block’s slots. Attach a ground conductor in each circuit at the busbar and the circuit breaker panel.
  11. Check to ensure that all wires are correctly wired.
  12. Reattach the front cover of the heater system.
  13. Turn the circuit breakers on
  14. The electric tankless heater will power on at this stage. Adjust the temperature to the desired calibrations.
  15. Open a water outlet and after the temperature has stabilized, feel if it’s your desired one. If not, adjust the temperature until you get comfortable.
  16. You may now enjoy using your hot water. The installation will be a success now that your water has heated up.


The above steps will guide you into getting the best hot water for your house use. Installing an electric tankless heater may get easy once you follow the steps. Essential requirements need to be met to assure you of safe usage. Ensure that routine maintenance gets done for a long-lasting lifespan to your system. Enjoy using hot water in your facility any time with the electric tankless water heater.









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