How to Flush a tankless water heater. 1 minute tutorial. 

Don't forget to clean the combustion air screen and inlet water screen! Those buggers get dirty

Also a good thing to note youre supposed to flush the opposite way the water typically circulates through the system

only thing I would do different, is not open the T&P valve ( unless I was prepared to replace it ) in my experience once you crack a older T&P valve open they’ll almost always seep .. 👍👍

I'm a home owner and a landlord.. I do this to my water heaters every year.. I also use a pool sock for all the sentiment that comes out so it doesn't circulates back in..

Homeowner never get that done. Wait till it breaks 😂

I like it 👍 good video as a licensed plumber in Oklahoma.

What about the in-line screen ? That needs to be removed and cleaned also def gonna be a call back

I never open up the ports until i rinse the lines and heat exchanger by taking water and running it just like i would white vinegar or haymaker

leave that hot valve closed when you flush the system with the t&p

That is a real hacky install! 😮

Don't forget to do visual inspection opening the door and clean it

I would recommend detaching cold side first, then pushing a bunch of water through the hot side, getting all of the unwanted solution out.

Great demonstration. Is it the same with a Navien tankless?

What does it look like when the system hasn't been flushed in years?

The caps! The sign of a pro.

Of all the tankless water heaters I have installed, no one has ever called me back to do the annual flush. So sad.

Open the cold after and keep the hot closed to flush out any remaining solution. Opening the hot side will surely send solution to fixtures in house. It’s very acidic so fill a couple of buckets to flush it out before opening the hot side.

Not gonna lie....I jumped when you almost pulled that pump hose off without shutting the valve again

That when it the gas water heater and you using underground water

👍🏻👍🏻

Thanks for the video! Question. Once I start my submersible pump the flushing starts, but after about 30 secs, water with the descaler solution stops shooting out back into the bucket. Any idea why this would happen? Tia

navien has a specific way. Warranty gets voided quickly if not doing it correctly

When the hose is in the water while the pump is going it stop it from coming out properly and fully empty. I used a siphon to clean my fist tanks. If I leave the hose that is filling under the water it’ll stop filling for some reason. Idk the physics but jus wanna make sure that ain’t happening to your tanks and it still has water or one.

Great video what type of pump did you use? How many gallons per minute or hour

I do not turn the gas off. Cleans the heat exchanger better.

I'll have to do some maintenance at my in-laws' place. Theirs is a few years old, so I'll be curious what the water will look like. Maybe this is a dumb question, but can you use an air compressor to flush it, instead of pumping the water out? Just because I already have an air compressor. 😅

What about the filter? When do you pull it out and clean before or after the flush

I personally have a Navien sell this brand... I have been very happy with it... Can I ask... what brand do you typically install or sell to customers?

I wanna know who installed that thing to begin with

You always want to remove the filter. Put it in the bucket so it can be soaking when you flush the tank with water heater. I do it for about forty five minutes.

How about also leaving the solution in and letting it heat up. It works in coffee machines.

Can you flush from just one side? The valve to the cold side isn't accessible. (The plumber that installed it helped flip the house and didn't care about what he was doing).

If you have a water softener do you still recommend this?

Do you also use gallon of water with vinegar

Get you a 5 gallon bucket, a $75 dollar pump off of Amazon, 3 gallons of vinegar & let it run 2-4 hours. Then check the screen to make sure that’s clear as well. Then have a second bucket with clean water to flush out the vinegar for 1 min. Repeat every 12 months.

What does doing that to the T&P valve at the end do?? When you were saying run some water through the lines when you’re done.

What’s the reason for this for limescale or something and how come the prv is on the hot in Britain ours goes on the cold as hot expands it goes back into cold and through blow off

%90 solid up till the end

How does it do with whole house reverse osmosis from well at 66 TDS?

What happens if you don’t turn the gas off on the flush?

What are you flushing if its a tankless water heater?

A plug connect for the water heater?

What type of pump is used in this video

What are you going to flush if there is no tank?

Meanwhile I’m enjoying my traditional gas water heater and doing nothing 🤣

totally easy to do yourself.

How old is that tankless? I been flushing them for a while and never seen one that dirty. Is there a softener install? Help me understand 😅

Is that galvanize steel?

Yeah, because the homeowner’s gonna go through all that bullshit

How often do I need to do that?

German plumbes are laughing 😂

What type of pump us that?

Will this help if the error message 13 pops up?

How can I flush mine if I don't have those fancy expensive valves?

If it's tankless... What's there to flush

No filter?

I'm running into a lot of situations they need flush twice a year

Sounds like a good opportunity to eat your lunch lol

They still haven't automated this process?

hmm..I don't agree with your last part where you flush out the vinegar out of the system..you show by forcing safety relief valve spring handle, it is quite common plumbers treating that safety relief like a regular valve, if it sat there for a while and play with valve it may start leaking, thus the exact way you were flushing the heat exchanger by closing both valves (cold and hot), but this time you open cold ,LEAVE hose attached to the hot outlet side with valve to end user off but the drain opened with hose into drain..easy-peasy, without disturbing safety relief valve..that's the plumba'way..no offense 😮

Wow cowboy much 😂😂

If you have one of these heaters, get a normal water heater.

What are you flushing if it's tankless?? Maybe it's a wash out?? Idk😂

What no flow test

Why are American heaters so complicated? Geez

This guys forgot all kinds of steps

The seller should come flush it for you for life since it cost twice as much to use as a regular hot water heater

Tankless, biggest POS on the market, super expensive per BTU, but they will not tell you that, just rip you off on the sale.

Everything is wrong on that tankless installation,not up to code

Do not buy these.