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

By Robert Flores / October 27, 2022

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

Why are tankless water heaters so expensive to install?

Tankless water heaters have a higher initial price compared to tank heaters, costing homeowners between $1,200–$3,500. The higher cost is a result of a more labor-intensive set-up, as new gas and water lines are required for installation. For electrical tankless heaters, new electric wiring will need to be installed. Sept 1, 2022

Do tankless water heaters smell?

If you notice a stale, musty, or rotting smell near your water heater, it might have a leak. This is rare for tankless water heaters, but they can leak occasionally. Make sure you check the area for water damage, remove any materials with biological growth, and get repairs if needed. Dec 17, 2018

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Do electric tankless water heaters need a vent?

Unlike gas or propane tankless water heaters, electric tankless water heaters do not need venting because they use electric burners to heat water rapidly. Since no natural or propane gas is used, no venting is needed. Jul 15, 2022

Can you flush the toilet when the power is out?

Can I shower or flush my toilet during a power outage? o Yes, you can still use a toilet in a power outage, and if it has trouble flushing you can easily fix this problem by pouring water into the bowl. o Showering during a power outage is perfectly safe.

Can I shower during a power outage?

Using your plumbing during a power outage is completely safe. Obviously, if you are worried about electrical surges or other rare occurrences then you shouldn’t take the risk for a hot shower. Your safety comes first during a power outage which is why it is important to have flashlights ready for just such an occasion.

Does a tankless gas water heater need a dedicated circuit?

Gas tankless water heaters use just a tiny amount of amperage to ignite the flame. Unless the manufacturer requires it, there is no need for a dedicated circuit. Aug 4, 2017

What happens if gas line is too small?

An undersized gas system can cause poor performance in the appliances. It could cause the burners to soot, pilots lights and burners to go out, or cause condensate to form in the heat exchanger of the furnace or water heater.

How do I know what size tankless water heater I need?

How to Select the Right Size Tankless Water Heater Determine the maximum number of devices you want to run and their total flow rate. Then, add up their flow rates (gallons per minute). … Determine required temperature rise. … Sizing Example: An average shower will be between 104–106° and uses 2.6 gallons of water.

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How do you install a tankless water heater in a shower?

Should I replace my hot water heater with a tankless?

Using a tankless water heater can reduce these costs by up to 50 percent, for an average annual savings of $80. They are durable and less likely to fail, causing potentially catastrophic flooding in your home. Tankless units have an average lifespan about twice that of conventional water heaters — 20 years or more.

How noisy is a tankless water heater?

Gas tankless hot water heaters all make noise when firing up and heating water, but the levels are usually less than 90 decibels.

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

What’s the cheapest way to heat water?

Usually natural gas is the cheapest way to heat water, followed by electricity, with propane being the most expensive.

What is the cheapest hot water system to run?

An electric heat-pump hot water heater uses much less electricity than an electric storage water heater, and are the most efficient hot water systems on the market. Aug 16, 2022

How much does it cost to install a tankless gas water heater?

The typical range for tankless heater installation is between $4,500 and $6,500, averaging out to around $5,500 (including the water heater, warranty and tune ups). The tankless heater installation without the unit can cost between $1800 and $3500, averaging out to around $2650. Aug 26, 2022

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How much does it cost to install an electric tankless water heater?

The national average for tankless water heater installation cost is around $2,800. Depending on the model, the units themselves usually cost between $500 and $2,000, with installation adding another $500 to $1,500. However, for large or specialty units, you may pay as much as $6,600 in total costs. Aug 8, 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

Do tankless water heaters give unlimited hot water?

In contrast, a tankless heater can provide unlimited hot water because it maintains 2-8 gallons per minute (gpm) of hot water as long as water is flowing through it. Jan 1, 2009

Is a tankless water heater worth the extra cost?

According to the U.S. Dept. of Energy, a tankless water heater is more efficient and uses less energy than a conventional water heater, providing a $25 to $107 in annual savings. If your hot water use is low (less than 41 gallons per day), a tankless water heater will be 24% to 34% more efficient. Jun 4, 2021

Resources

Tankless Water Heater Installation Tips. Things to Consider


https://www.thisoldhouse.com/plumbing/reviews/water-heater-installation-cost
https://www.arcticair4me.com/blog/2018/december/3-common-signs-of-tankless-water-heater-issues/
https://www.monkeywrenchplumbers.com/learning-center/existing-venting-for-tankless-water-heater

Common FAQs Concerning Power Outages

Can you shower during a power outage?


https://forums.mikeholt.com/threads/tankless-gas-water-heater.137078/
http://users.snowcrest.net/thriftysupply/pdf/RTG-Gas_Piping_Facts.pdf

How to Select the Right Size Tankless Water Heater



https://www.ahs.com/home-matters/repair-maintenance/installing-tankless-water-heater/
https://todayshomeowner.com/problem-with-noise-from-tankless-hot-water-heater/
https://prudentreviews.com/tankless-water-heaters-pros-and-cons/
https://todayshomeowner.com/what-is-the-cheapest-way-to-heat-water-for-your-home/
https://www.sustainability.vic.gov.au/energy-efficiency-and-reducing-emissions/save-energy-in-the-home/water-heating/choose-the-right-hot-water-system

Tankless Water Heater Installation Cost


https://www.thisoldhouse.com/plumbing/reviews/tankless-water-heater-installation-cost
https://www.eccotemp.com/blog/6-common-tankless-water-heater-problems-and-how-to-solve-them/index.php
https://www.facilitiesnet.com/hvac/article/Tankless-Water-Heaters-Provide-Unlimited-Hot-Water–10399

Are Tankless Water Heaters Worth The Investment?

About the author

Robert Flores