Do tankless water heaters need a T&P valve?

By Robert Flores / October 27, 2022

It’s a requirement for a tankless water heater to function effectively and efficiently. Tank–type water heaters have the temperature and pressure relief valve combo. Typically, a tankless water heater pressure relief valve ensures pressure stability to prevent damage and injury. Jun 25, 2022

How do you ignite a tankless water heater?

Turn the gas shut-off valve counterclockwise to the “On” position. Turn the electric breaker back on or turn on the power switch to start the unit.

What is normal gas pressure?

A common operating pressure for natural gas appliances is around 7 inches of water column (WC) or re-stating this in equivalent measure, that’s 14.9 millibars or 1743 Pascals or Pa, or about 0.25 psi (pounds per square inch) or about 4 ounces of pressure per square inch. See NATURAL GAS APPLIANCE PRESSURES for details.

How far does a tankless water heater vent need to be from a window?

Indoor Installations A tankless water heater requires a 4-foot clearance from the side or below a door or window that opens, unless the unit is directly vented to the outside, says Ernie Graves. If the water heater is installed above the door or window, it needs 12 inches of clearance.

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How do you check gas pressure on a tankless water heater?

Can you vent a tankless water heater vertically?

All indoor tankless gas water heaters must be vented vertically or horizontally to the outdoors using factory approved venting material (No other venting material is permitted). See the Use and Care Manual for important information regarding the venting installation and materials for your tankless water heater.

What happens if a water heater is not vented properly?

A vent connector is the thing that takes the exhaust gases from the top of the water heater (draft hood) to the vent. If a vent connector isn’t properly installed, the potential for the water heater to backdraft increases. Oct 1, 2013

Where should a tankless electric water heater be installed?

As long as enough combustion air is provided, tankless water heaters can be installed in place of your old water heater or anywhere in your home. This includes utility rooms, garages, basements, attics, or mounted on outside walls. They can even be installed in locations where a storage water heater wouldn’t fit.

Where is PEX not allowed?

You can’t install PEX in high heat areas like near recessed lighting. This also means you can’t connect PEX directly to a hot water heater, but you can use a connecting material to do this. PEX is semi-permeable, which means liquid can enter the pipe. Aug 2, 2018

How many GPM is a shower?

A standard 2.5 GPM shower head uses 2.5 gallons of water each minute. That’s 25 gallons for a 10-minute shower. VS. A low-flow 1.8 GPM shower head uses 1.8 gallons of water each minute.

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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

Are old toilets better than new ones?

Should I Replace My Old Toilet? While your old toilets may technically do their job, they’re simply not as efficient as newer models. Not to mention if your old toilets start to show their age by cracking, leaking, or clogging, it’s often best to consider replacement rather than repair. Jun 29, 2022

How much water does a 20 minute shower use?

If a standard showerhead is fitted, it will use around an extra half a gallon each minute, accounting for a 25-gallon emittance every 10 minutes, or 50 gallons throughout a 20-minute shower. Oct 20, 2020

What is the average life of a tankless water heater?

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 size tankless water heater do I need for my house?

SELECTING A TANKLESS WATER HEATER Consider how many of these needs you may have simultaneously to determine the maximum flow rate you require. For a home with 1 bathroom, we recommend 6-7 GPM; 2 bathrooms, 8 – 9 GPM; and 3+ bathrooms, 9-11 GPM.

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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Can a tankless water heater fill a tub?

Yes, usually. A tankless water heater can provide hot water indefinitely, which means it will fill up the tub. However, you still need to consider how fast the heater can provide the temperature of water you want. Faucets work by mixing in hot water with the cold. Feb 22, 2022

How much does it cost to switch from tank to tankless water heater?

The cost to switch to a tankless water heater system is about the same as having one installed: an average of $2,800 with a range between $1,200 and $2,500. Aug 8, 2022

What size tankless water heater do I need for a family of 5?

In short, a family of 5 would need a 10 GPM gas tankless heater or 27 kW electric tankless heater if you live in the northern part of the USA, where the input water has a lower temperature. The tankless heater has to work extra hard to bring the water temperature up to 110?F or 120?F.

Can you claim a tankless water heater on your taxes?

If a tankless water heater has a UEF rating of . 82 and above, it qualifies for a rebate no matter the brand. And if you purchase any tankless water heater, you can get $300 back on your taxes. Oct 25, 2021

Resources

https://thearchitecturedesigns.com/electric-tankless-water-heater-require-a-pressure-relief-valve/
https://homeguides.sfgate.com/operate-tankless-water-heaters-34045.html
https://inspectapedia.com/plumbing/Gas_Pressures.php
https://homeguides.sfgate.com/setback-window-tankless-water-heater-105718.html

https://www.rheem.com/tankless-water-heater-venting-101/

Water Heater Backdrafting, Part 2 of 2: Why It’s Happening and How To Fix It


https://www.homedepot.com/services/c/tankless-water-heater-installation/c88b47f07

PEX Plumbing Disadvantages: What You Need to Know


https://www.waterpik.com/shower-head/blog/shower-head-gpm/

What is the water flow rate to most fixtures in my house?


https://www.pilgrimplumbingheating.com/blog/2022/june/why-you-should-replace-old-outdated-toilets/

How much water does a 20 minute shower use?

The Pros and Cons of a Tankless Water Heater

Tankless Water Heater Buyer’s Guide

Tankless Water Heater Installation Cost

Can a Tankless Water Heater Fill an Oversized Bathtub?


https://www.thisoldhouse.com/plumbing/reviews/tankless-water-heater-installation-cost

What Size Tankless Water Heater Do I Need? (2,3,4,5,6 Family)


https://www.monkeywrenchplumbers.com/learning-center/2022-tankless-water-heater-rebates

About the author

Robert Flores