What size tankless water heater do I need to replace a 40 gallon?

By Robert Flores / October 27, 2022

Comparing a 3.2 GPM tankless water heater to a forty gallon tank type heater is possible. For example, if a tankless unit produces hot water at 3.2 gallons per minute, this rate of flow will run a 40 gallon tank type heater out of water in only ten minutes.

What size tankless water heater do I need for a family of 1?

Sizing Guide for Residential Tankless Water heater Household Occupants Usage Capacity Required (Measured in Gallon) Electric 1-2 people Regular/ Low 30 High 40-50 6 more rows

Will a tankless water heater work with a 1/2 gas line?

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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What uses the most water in a house?

The largest use of household water is to flush the toilet, followed by taking showers and baths. Toilets account for nearly 30 percent of an average home’s indoor water consumption. Apr 30, 2018

How much water should a 2 person household use?

On average in the US, water use at home (water from the tap, toilet, dishwasher, etc.) adds up to about 138 gallons per household per day, or 60 gallons per person per day. Apr 25, 2020

Is it cheaper to take a bath or shower?

Water Usage A tub takes up a lot of water making it more costly than a shower. While it may seem comfortable to soak yourself in a warm bath, it takes up a lot of water, which may result in high sewerage bills and monthly water expenses.

How much does a 1 hour shower cost?

Assuming that the rates of electricity and water in your area are near the national average, 12 cents per kilowatt-hour and $1.50/1k U.S. gallons, each shower will cost you 25 cents or 51 cents per day for the whole household, according to the shower cost calculator by Omni. Apr 22, 2019

Is it better to have one large water heater or two smaller ones?

Greater efficiency can be achieved by installing multiple, smaller tankless water heaters throughout the home. Hot water is then drawn from nearby tankless appliances instead of being lead through the home’s entire plumbing system from basement to point-of-use.

What’s the average cost for an 80 gallon water heater?

$2,600 to $5,000 The national average cost range to replace an 80-gallon water heater is $2,600 to $5,000, with most people paying around $3,500 for a high-efficiency 80-gallon gas-powered water heater in a direct replacement. May 13, 2022

What is the most common problems with tankless water heaters?

Here are six of the most common problems and maintenance concerns for tankless water heaters: Mineral Buildup. System Overload. Cold Water Sandwich. Air Supply or Exhaust Blockage. Ignition Failure. Flame Failure. Mar 9, 2022

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Can you take two showers at once with tankless water heater?

Depending on the flow rate of your water heater, you may be able to take a shower and use hot water at the kitchen sink at the same time, but you probably won’t be able to run two showers and the kitchen sink. You could, of course, install two tankless heaters to provide you with a greater output of hot water. Jan 29, 2018

What is the downside of a tankless water heater?

In addition to high upfront costs, tankless water heaters have several other disadvantages compared to tank-style water heaters: they take longer to deliver hot water. the water temperature is inconsistent when multiple outlets are on simultaneously. they cannot provide hot water during a power outage. Oct 16, 2022

Do I need to upgrade my electrical panel for a tankless water heater?

Tankless electric water heaters usually require an upgrade in electrical service, something the home improvement stores often do not mention.

Are tankless water heaters 110 or 220?

Voltage. To reduce the amp draw, all electric tankless water heaters operate on a 240-volt circuit.

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

Are tankless water heaters hardwired?

And as you might expect, all of the 240 volt electric tankless units require hardwiring.

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How hard is it to put a tankless water heater in?

Tankless water heater replacement is a complex process that involves the skills of a highly trained technician. Unless you are experienced and comfortable enough to solder pipe, make gas connections and following local codes, hire a licensed professional.

Why is my tankless water heater tripping the breaker?

Breaker Breaker There are three possible explanations for a breaker being tripped by a hot water heater: water dripping on the electrical lines, a problem with the unit’s thermostat or a problem with the breaker. A malfunctioning thermostat is the most common cause. In this case, the thermostat should be replaced. Dec 6, 2018

How much electric do you need for a tankless water heater?

Key points. Most American families use around 50 gallons of hot water per day. To meet this demand, an electric tankless water heater will use 9–12 kWh of electricity. An electric tankless water heater needs about 3 kWh of electricity to heat a 10-minute shower. Jan 21, 2022

How much gas pressure does a tankless water heater need?

However, the following conditions must be met: The minimum static gas pressure must be 8 in. w.c. or greater; The calculated dropped pressure (the static pressure minus the 3.0 in. pressure drop), must be greater than the highest minimum gas pressure required by any of the gas appliances on the system.


Tankless WaterHeater FAQ’s

What Size Tankless Water Heater Do I Need?

Tankless Water Heater Installation Tips. Things to Consider


Indoor Water Use at Home

Is it Cheaper to Install a Tub or a Shower?

This is How Much Those Hot Showers Cost You Each Year


How Many Amps Does A Tankless Water Heater Use? (42-167 Amps)

What Size Breaker for Electric Tankless Water Heater?

110 Volt Tankless Water Heater: What You Need to Know


About the author

Robert Flores