Readers ask: How To Wire A Tankless Hot Water Heater?

Do tankless water heaters need special wiring?

You cannot use an electric tankless water heater in place of an electric tank without a significant upgrade in wiring and most probably adding new breakers to make a total of two or three breakers.

What are the electrical requirements for an electric tankless water heater?

Unfortunately, the average electric tankless water heater needs at least 120 amps to operate and the average household’s total capacity is 200 amps. This means you will have to upgrade your electrical system to accommodate for the larger load demand, which could cost you up to $1,500.

What kind of wire do I need for a tankless water heater?

You must utilize either a 120- or 240-volt circuit, wholly devoted to the heater. Both voltages require 8-gauge wire, and the section exposed to the area under the sink must be armored cable.

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Can a homeowner install a tankless water heater?

Installation. While it is possible to install your own tankless water heater, it’s not a job for inexperienced do-it-yourselfers. There are a number of different sizes and styles of tankless water heaters, including propane, natural gas and electric, along with single-room or whole-house sized models.

What size breaker do I need for a tankless water heater?

A gas tankless water heater only needs a 15-amp, 120 volt dedicated single-pole breaker for this purpose.

Do tankless water heaters need a neutral?

A straight 240 volt appliance like and air conditioner compressor, water heater etc do not require a neutral. Units like a dryer or stove can have 120 volt loads like for timers and lights and require a 120/240 volt circuit with a neutral.

What is the downside of a tankless water heater?

The primary disadvantage of on demand or instant hot water heaters is the upfront cost. The smaller units that you often see won’t produce enough hot water to serve most households. They’ll only serve one faucet at a time—a problem if you want to shower while the dishwasher is running.

Will 100 amp service run a tankless water heater?

Pro Tip: An electric device uses as much as 36KW(!!!) of electricity, or 150 Amp maximum power draw. If you have a 100 Amp service, your water heater will not work, unless you get the lower 9KW unit. However, it is only good for a small household of 1-2 people and provides 2 gallons per minute.

Do electric water heaters require 220?

Voltage Requirements Most electric hot water heaters operate on 220 to 250 volts AC. This voltage in homes requires a double circuit breaker rated for the amperage draw of the hot water heaters.

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Why do tankless water heaters need 3 breakers?

The reason being is that in most homes the existing electrical system will not support a tankless water heater that is the right size for the home. That type of heater up until now would require the addition of 3 circuit breakers to the interior panel and pulling three new circuits.

Is it worth the money to get a electric tankless water heater?

Both rate Good for energy efficiency. Tankless: Gas and electric tankless water heaters run more efficiently than the conventional water heaters of the same fuel type. We rated the annual energy consumption cost Excellent for a gas model but only Fair for an electric, but both rate Very Good for energy efficiency.

How many amps does a small tankless water heater use?

One whole-house tankless water heater has four 7,000-watt elements, for a total electrical load of 28,000 watts. This load re- quires wire and a circuit breaker that will handle at least 120 amps, at a cost many times that of electrical service to a conventional tank water heater.

Why is tankless water heater installation so expensive?

Installation is expensive because the unit needs a bigger gas supply than a conventional water heater does, and it needs to run its own exhaust flue to the exterior. Installation costs can vary widely, depending on the location of the flue and the gas supply. The unit itself costs between $800 and $1,000.

Why do tankless water heaters cost more to install?

In general, purchasing and installing a tankless water heater costs about 2 to 2.5 times as much as a standard water heater because of the higher production costs of the unit, venting, and resizing the gas line and gas meter required to support the unit’s demand.

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Are tankless water heaters a fire hazard?

Because there is no tank which can overheat or experience a massive spike in pressure, a tankless system doesn’t have the danger of bursting or exploding. Tank systems can grow hot on their exterior and often have open flames. Tankless water heaters do not have any of these issues, and they don’t use pilot lights.

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