How much room do you need for a tankless hot water heater?

By Robert Flores / October 26, 2022

The unit heats the water as long as this is open. When it is closed, the tankless unit stops heating the water. It is true that tankless water heaters do not require a lot of space. A large unit requires an area no larger than 24 inches square and ex- tends from the wall by about 8 to 10 inches.

Are tankless 2022 water heaters worth it?

Yes. In fact, a tankless water heater will last almost twice as long as a conventional water heater. Traditional models with a storage tank tend to last around 10-12 years with proper maintenance. On the other hand, a tankless water heater will last for approximately 20 years. Feb 28, 2022

Can a tankless water heater work for the whole house?

Both gas and electric water tankless heaters can function as whole-house solutions or as a smaller “point-of-use” system. Smaller single-use tankless water heaters heat water for just a single room, tap, or appliance. These larger and smaller systems essentially work in the same way.

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How do I size a tankless water heater for my house?

There are two factors that need to be considered when sizing a tankless water heater: Flow Rate (GPM): How much hot water you will need at any given time. Temperature Rise (ΔT): The difference between the incoming cold water temperature and the desired temperature.

What is a normal gpm for a house?

For most single-family homes, a minimum flow of 6 GPM is suggested from a well or spring. This flow would provide 360 gallons of water each hour, which would be sufficient to meet most home water peak demands. Aug 26, 2022

How many gallons per minute does a toilet use?

2-3 gallons per minute A toilet will normally use about 2-3 gallons per minute (gpm), a shower from 1.5 to 3.0 gpm, a bathroom or kitchen faucet from 2-3 gpm, a dishwasher from 2-4 gpm, and a washing machine from 3-5 gpm. Aug 23, 2019

Can I install a tankless water heater myself?

Learning how to install a tankless water heater is a difficult and sometimes dangerous process. We highly recommend having a professional handle this task. Follow all local plumbing and electrical codes when sourcing and installing parts for your new water heater. Local codes can vary.

How long does it take to install a tankless water heater?

between one to three hours Afterward, the tankless unit must also be mounted and connected. Tankless to Tankless Installation: This generally takes between one to three hours.

Can my breaker panel handle a tankless water heater?

Do not use the same calculated amperage as your final size breaker for tankless water heater. Otherwise, you’ll risk accidents because there’ll be no protection for a power surge. The National Electric Code (NEC) states that a circuit breaker should only handle 80% or less of its total capacity. Oct 3, 2022

Do tankless water heaters require 220?

Requirements for electric tankless water heaters: Voltage — Many retailers sell units that will accommodate 110V, 120V, 208V, 220V, 240V, and 277V.

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How long do tankless water heaters last?

Some people hesitate to decide on a tankless water heater because they can be a slightly higher cost; however, you get significantly more life out of one. A standard water heater tank lasts about 8-12 years. A tankless water heater can last as long as 25 years!

What is the most efficient hot water heater?

A hybrid water heater or a heat pump water heater is one of the most energy-efficient electric water heaters available nowadays. Such units do require electricity to move heat. Mar 30, 2022

Does shutting down water to house affect water heater?

Realistically there is no danger to having the tank on with the water off. Especially since the tank works off water pressure to supply hot water. The tank pressure will be equal to your water pressure. If there is no inlet water pressure, there will be no outlet water pressure. Jan 8, 2014

How long can water sit in water heater?

Most homeowners should flush their water heaters every six months or so, but if you have extremely hard water, you may want to do it more often. Aug 26, 2022

Which is better hot water heater or tankless?

According to, “For homes that use 41 gallons or less of hot water daily, demand (or tankless) water heaters can be 24% to 34% more energy efficient than conventional storage tank water heaters.” Tankless water heaters (if gas-fired) will save homeowners over $100 annually the longer they remain in service.

How can I make my tankless water heater quieter?

How To Reduce Noise From A Tankless Water Heater (12-Step Guide) Check The Blower Fan For Insects And Lizards. Check The Blower Fan For Proper Balancing. Check The Pressure Relief Valve If There Is A Tea Kettle Sound. Install Anti-Vibration Mounts. Soundproof The Area Around The Tankless Water Heater. More items…

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Do tankless water heaters need expansion tanks?

The IPC does not specifically require a thermal expansion tank to be installed with tankless water heaters. However, if a storage tank is used in conjunction with a tankless water heater in a closed system, which is sometimes the case with recirculation, then a means of controlling thermal expansion must be provided. Jun 21, 2015

How many gallons of hot water does a shower use?

An average shower uses 56 litres (15 gallons) of hot water based on a water saving shower head using 7 litres/min (1.8 gallons/min) and a shower duration of 8 minutes. Assuming an average 8 minute hot water shower, consumption is 56 litres (15 gallons) of hot water to take a shower. Oct 14, 2022

How do I convert my gas water heater to tankless?

This includes: Mounting the tankless water heater. Running the water heater’s vent to meet local code regulations (for gas models) Installing the gas line (for gas models) Installing new water lines. Installing the pressure relief valve. Connecting the electrical supply to the water heater. More items…

What size gas line is needed for a tankless water heater?

¾-inch Check the gas supply A typical tankless water heater will need a ¾-inch gas line. However, if there is sufficient pressure and the run length is short enough, a ½-inch line may be sufficient with certain tankless water heaters, such as the Noritz EZ Series. Nov 8, 2018


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About the author

Robert Flores