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popularCRSRx posted Jul 18, 2026 3:16 PM

A.O. Smith Signature Series 6.6-GPM 160000-BTU Indoor Natural Gas Ultra-Low NOx Tankless Water Heater Stainless Steel one_size | GT15-240-NI $609

$609

$1,218

50% off
Lowe's
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Looks like a good deal. I currently have a Takagi tankless which has been wonderful. I believe the AO Smith line is made by Takagi.

https://www.lowes.com/pd/A-O-Smit...ccQAvD_BwE
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Looks like a good deal. I currently have a Takagi tankless which has been wonderful. I believe the AO Smith line is made by Takagi.

https://www.lowes.com/pd/A-O-Smit...ccQAvD_BwE

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12 Comments

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Jul 18, 2026 3:24 PM
113 Comments
Joined Mar 2009
DrLaxJul 18, 2026 3:24 PM
113 Comments
Except for the label, it looks exactly like my Takagi tankless. Same 15-year heat exchanger guarantee, 5-year parts guarantee as Takagi.
Last edited by DrLax July 18, 2026 at 08:28 AM.
1
Jul 18, 2026 5:30 PM
341 Comments
Joined Feb 2008
poorSAPJul 18, 2026 5:30 PM
341 Comments
Are these more efficient than a tank water heater? I read they need to be cleaned on a yearly basis
Jul 18, 2026 7:18 PM
7 Comments
Joined Feb 2024
nhantdbJul 18, 2026 7:18 PM
7 Comments
plus $79 delivery
Jul 18, 2026 9:18 PM
1.7K Comments
Joined Oct 2006
bjammJul 18, 2026 9:18 PM
1.7K Comments
Quote from poorSAP :
Are these more efficient than a tank water heater? I read they need to be cleaned on a yearly basis
Yes this one says its 94% efficient (meaning 94 percent of the energy used is to heat water and only 6% is lost elsewhere). You're also only heating water on demand instead of keeping it hot at all times. Its recommended to flush them yearly but some of the newer models out now have some kind of scale inhibitor so its not required anymore but still recommended to extend life.
Jul 20, 2026 12:22 PM
262 Comments
Joined Sep 2011
papaswedineJul 20, 2026 12:22 PM
262 Comments
Quote from poorSAP :
Are these more efficient than a tank water heater? I read they need to be cleaned on a yearly basis
You're supposed to flush your tanked water heaters annually (minimum) also... 😂
Jul 20, 2026 7:09 PM
457 Comments
Joined Jun 2006
FritzTheCatJul 20, 2026 7:09 PM
457 Comments
Thanks OP. Got one...had to drive 25 miles, but great deal.
My Tanked water heater is 15 years old, working fine...but has never had any maintenance done.
Downloaded the PDF manual before I got it, and it looks easy enough to install myself.
Google says tanked water heaters last 8 - 12 years and tankless last up to 20 years.
Jul 20, 2026 7:14 PM
457 Comments
Joined Jun 2006
FritzTheCatJul 20, 2026 7:14 PM
457 Comments
Quote from nhantdb :
plus $79 delivery
They're only 75 pounds. Pick it up.

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Jul 22, 2026 9:52 PM
457 Comments
Joined Jun 2006
FritzTheCatJul 22, 2026 9:52 PM
457 Comments
Coincidentally: I bought this water heater Monday...
This is Wednesday (Yesterday (Tuesday) I had a great motorcycle ride, got rained on and everything_}
So this morning my moisture detector under my water heater tank went off, notifying the app on my phone.
My water heater sprung a pretty significant leak.
(Yes, moisture detectors really work! I recommend them highly. Also detected a minor leak in the faucet feeding the washing machine.)
So, I spent my day getting estimates for installation of this water heater.
(I did want to do it myself, but my wife wants it done and done right, and done fast...go figure.)
So, $2,400 some odd for installation and $600 some odd for this water heater (Thanks again OP) for a total of about $3,100.
I swear I didn't touch the existing water heater!
1
Jul 25, 2026 1:49 AM
4.5K Comments
Joined Jan 2011
carlson03Jul 25, 2026 1:49 AM
4.5K Comments
Quote from FritzTheCat :
Coincidentally: I bought this water heater Monday...This is Wednesday (Yesterday (Tuesday) I had a great motorcycle ride, got rained on and everything_}So this morning my moisture detector under my water heater tank went off, notifying the app on my phone.My water heater sprung a pretty significant leak.(Yes, moisture detectors really work! I recommend them highly. Also detected a minor leak in the faucet feeding the washing machine.)So, I spent my day getting estimates for installation of this water heater.(I did want to do it myself, but my wife wants it done and done right, and done fast...go figure.)So, $2,400 some odd for installation and $600 some odd for this water heater (Thanks again OP) for a total of about $3,100.I swear I didn't touch the existing water heater!
I think to replace a tanked water heater requires quite a bit of changes to the gas lines... My local Lowes has one and I would love to swap it, but would also have to pay someone. I installed my last tank heater about 10 years ago
Jul 25, 2026 1:27 PM
1.5K Comments
Joined Jul 2016
AG1802Jul 25, 2026 1:27 PM
1.5K Comments
We installed one of these during Covid in 2020 that we purchased at Lowe's. Looks like this one but ours had larger capacity. Works great so far. Haven't done much maintenance on it. I know I know. I'm waiting for trouble.

I didn't have to switch out any gas lines since my home has a gas furnace using the same intake and our Bradford White tank gas heater was in the same utility cabinet.granted our home was built in 2012 so maybe thats why didn't have to mess with the lines

The only really downside is that it was mounted on an interior wall so when you turn on the hot water at your faucet you hear a faint rumble from the laundry where this was installed. Idk if it was the installation or the unit itself but the only minor annoyance so far
Last edited by AG1802 July 25, 2026 at 06:30 AM.
Jul 25, 2026 2:30 PM
98 Comments
Joined Aug 2019
RonSwansunJul 25, 2026 2:30 PM
98 Comments
I got this when it went on sale in 2021. Mine needed a larger NG supply line but that was not too bad because the branch was within 10 ft or so of the install location. Also installed it with the valve set that included flushing connections. It also needs a condensate drain (I used CPVC because that is rated for higher temperatures but it is a gravity drain line so pretty simple). I love this thing.
Jul 27, 2026 10:28 PM
457 Comments
Joined Jun 2006
FritzTheCatJul 27, 2026 10:28 PM
457 Comments
Quote from carlson03 :
I think to replace a tanked water heater requires quite a bit of changes to the gas lines... My local Lowes has one and I would love to swap it, but would also have to pay someone. I installed my last tank heater about 10 years ago
It requires a 3/4" gas line, and mine was 1" until the last couple of feet, so it was really no problem.
I too changed a tank type about 4 or 5 years ago. Except for the weight, it was really easy.

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