Tankless Water Heater Freezing

 
Thread Tools Search this Thread Display Modes
Old 01-05-2010, 08:18 PM   #1
Pro
 
Mitch M's Avatar
 
Trade: General Contractor
Join Date: Dec 2006
Location: NC
Posts: 498
Rewards Points: 250

Tankless Water Heater Freezing


I have a client who has a tankless water heater mounted on the exterior. He has had the pipes frozen over the last couple of nights because of the cold. The unit is mounted on the exterior wall and the pipes go in right at the unit into the interior. What can we do to keep them from freezing?

Thanks for your help.
__________________
"I will neither confirm nor deny"
Mitch M is offline  

Warning: The topics covered on this site include activities in which there exists the potential for serious injury or death. ContractorTalk.com DOES NOT guarantee the accuracy or completeness of any information contained on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling task!

   
 

Old 01-05-2010, 08:21 PM   #2
LRG WoodCrafting

 
Leo G's Avatar
 
Trade: DIY Home Owner
Join Date: May 2005
Location: Windsor Locks, Connecticut
Posts: 22,875
Rewards Points: 11,826

Re: Tankless Water Heater Freezing


Put it on the inside of the house where it belongs.

__________________
Sawdust Follows Me Everywhere
I can explain it to you, but I can't understand it for you.

Quote:
Originally Posted by HusqyPro View Post
Carpenter by day.
Mad scientist by night.
http://lrgwood.com
Custom Cabinets in Hartford County Connecticut
Leo G is online now  
The Following User Says Thank You to Leo G For This Useful Post:
genecarp (01-05-2010)
Old 01-05-2010, 08:27 PM   #3
The Grand Wazoo
 
KillerToiletSpider's Avatar
 
Trade: It blowed up real good!
Join Date: May 2007
Location: Illinois
Posts: 3,714
Rewards Points: 1,454

Re: Tankless Water Heater Freezing


Quote:
Originally Posted by Mitch M View Post
I have a client who has a tankless water heater mounted on the exterior. He has had the pipes frozen over the last couple of nights because of the cold. The unit is mounted on the exterior wall and the pipes go in right at the unit into the interior. What can we do to keep them from freezing?

Thanks for your help.
Build a heated shed around the water heater.
__________________
A flush is better than a full house.
KillerToiletSpider is online now  
Old 01-05-2010, 08:28 PM   #4
Working
 
Cole82's Avatar
 
Trade: GC
Join Date: Nov 2008
Location: Cedar Rapids, IA
Posts: 4,065
Rewards Points: 2,122
Send a message via AIM to Cole82

Re: Tankless Water Heater Freezing


Tell them to shower more than once a week. The in/ex is letting cold air inside the water heater.

Guys I think it is inside the house but on an exterior wall.
__________________
Cole's Custom Creations
Cedar Rapids, Iowa

The boss of awesome
Cole82 is offline  
Old 01-05-2010, 08:30 PM   #5
Pro
 
genecarp's Avatar
 
Trade: LI,NY designer, new homes, renovation work, concre
Join Date: Mar 2008
Location: Long Island, NY
Posts: 5,425
Rewards Points: 2,000

Re: Tankless Water Heater Freezing


Quote:
Originally Posted by KillerToiletSpider View Post
Build a heated shed around the water heater.

Mind as well make it a 8' x 10' so at least they can store the lawn tools, maybe even put a sink in it, (with hot water), GMOD
__________________
genecarp is offline  
Old 01-05-2010, 08:45 PM   #6
Pro
 
Mitch M's Avatar
 
Trade: General Contractor
Join Date: Dec 2006
Location: NC
Posts: 498
Rewards Points: 250

Re: Tankless Water Heater Freezing


Oh come on guys. It is one of those small tankless water heaters that is mounted on the outside wall. The pipes go into a heated space but the pipes directly on the outside freeze. They are wrapped with the foam insulation wraps but apparently it is not doing any good.
__________________
"I will neither confirm nor deny"
Mitch M is offline  
Old 01-05-2010, 08:48 PM   #7
LRG WoodCrafting

 
Leo G's Avatar
 
Trade: DIY Home Owner
Join Date: May 2005
Location: Windsor Locks, Connecticut
Posts: 22,875
Rewards Points: 11,826

Re: Tankless Water Heater Freezing


What makes you think I am kidding? A water heater in a freezing climate will have problems with the pipes freezing. What is the reason that it is mounted outside?
__________________
Sawdust Follows Me Everywhere
I can explain it to you, but I can't understand it for you.

Quote:
Originally Posted by HusqyPro View Post
Carpenter by day.
Mad scientist by night.
http://lrgwood.com
Custom Cabinets in Hartford County Connecticut
Leo G is online now  
Old 01-05-2010, 08:56 PM   #8
Pro
 
Mitch M's Avatar
 
Trade: General Contractor
Join Date: Dec 2006
Location: NC
Posts: 498
Rewards Points: 250

Re: Tankless Water Heater Freezing


Quote:
Originally Posted by Leo G View Post
What makes you think I am kidding? A water heater in a freezing climate will have problems with the pipes freezing. What is the reason that it is mounted outside?
I did not mount it. It is for one of my regular customers. It is like a lot of the ones that I have seen around. It is gas so it is vented. It is designed to be mounted outside. I think they just forgot to how to stop the frozen pipes.
__________________
"I will neither confirm nor deny"
Mitch M is offline  
Old 01-05-2010, 09:05 PM   #9
Working
 
Cole82's Avatar
 
Trade: GC
Join Date: Nov 2008
Location: Cedar Rapids, IA
Posts: 4,065
Rewards Points: 2,122
Send a message via AIM to Cole82

Re: Tankless Water Heater Freezing


I was wrong it is mounted outside...

Why would any body do such a thing in NY?


"T-K3-OS is ideal for warmer climates"
__________________
Cole's Custom Creations
Cedar Rapids, Iowa

The boss of awesome
Cole82 is offline  
Old 01-05-2010, 09:19 PM   #10
LRG WoodCrafting

 
Leo G's Avatar
 
Trade: DIY Home Owner
Join Date: May 2005
Location: Windsor Locks, Connecticut
Posts: 22,875
Rewards Points: 11,826

Re: Tankless Water Heater Freezing


North Carolina.
__________________
Sawdust Follows Me Everywhere
I can explain it to you, but I can't understand it for you.

Quote:
Originally Posted by HusqyPro View Post
Carpenter by day.
Mad scientist by night.
http://lrgwood.com
Custom Cabinets in Hartford County Connecticut
Leo G is online now  
The Following 2 Users Say Thank You to Leo G For This Useful Post:
Cole82 (01-05-2010), Mitch M (01-06-2010)
Old 01-05-2010, 09:27 PM   #11
Pro
 
painterman's Avatar
 
Trade: Historic Restorations
Join Date: Feb 2005
Posts: 363
Rewards Points: 274

Re: Tankless Water Heater Freezing


wrap the pipes with heat tape
painterman is offline  
Old 01-05-2010, 09:32 PM   #12
Capra aegagrus
 
Tinstaafl's Avatar
 
Trade: Remodeler
Join Date: Jan 2008
Location: Central Pennsylvania
Posts: 16,319
Rewards Points: 3,584

Re: Tankless Water Heater Freezing


Yeah, it does freeze sometimes in NC. I've been there when there was freezing rain, and it ain't a pretty sight.

Probably the simplest quick fix would be heat tapes. Until you can get that set up, just have him let the water trickle (or even just a fast drip) at a HW faucet whenever the temps are low. As long as the water's moving even a little bit, it takes some pretty low temps to freeze it solid.
Tinstaafl is online now  
Old 01-05-2010, 09:41 PM   #13
The Grand Wazoo
 
KillerToiletSpider's Avatar
 
Trade: It blowed up real good!
Join Date: May 2007
Location: Illinois
Posts: 3,714
Rewards Points: 1,454

Re: Tankless Water Heater Freezing


Quote:
Originally Posted by Tinstaafl View Post
Yeah, it does freeze sometimes in NC. I've been there when there was freezing rain, and it ain't a pretty sight.

Probably the simplest quick fix would be heat tapes. Until you can get that set up, just have him let the water trickle (or even just a fast drip) at a HW faucet whenever the temps are low. As long as the water's moving even a little bit, it takes some pretty low temps to freeze it solid.
That won't work with a tankless water heater.
__________________
A flush is better than a full house.
KillerToiletSpider is online now  
Old 01-05-2010, 09:50 PM   #14
Capra aegagrus
 
Tinstaafl's Avatar
 
Trade: Remodeler
Join Date: Jan 2008
Location: Central Pennsylvania
Posts: 16,319
Rewards Points: 3,584

Re: Tankless Water Heater Freezing


Quote:
Originally Posted by KillerToiletSpider View Post
That won't work with a tankless water heater.
I was waiting for that!

I admit I have no hands-on experience with them, so correct me if I'm wrong (like you wouldn't ). The idea is not to get it to fire up--I know you need significant flow for that. It's just to keep the water moving ever so slightly.

Shirley you aren't saying that a tankless won't allow you to run a trickle, as long as you don't care whether it's heated?
Tinstaafl is online now  
Old 01-05-2010, 09:59 PM   #15
The Grand Wazoo
 
KillerToiletSpider's Avatar
 
Trade: It blowed up real good!
Join Date: May 2007
Location: Illinois
Posts: 3,714
Rewards Points: 1,454

Re: Tankless Water Heater Freezing


Quote:
Originally Posted by Tinstaafl View Post
I was waiting for that!

I admit I have no hands-on experience with them, so correct me if I'm wrong (like you wouldn't ). The idea is not to get it to fire up--I know you need significant flow for that. It's just to keep the water moving ever so slightly.

Shirley you aren't saying that a tankless won't allow you to run a trickle, as long as you don't care whether it's heated?

You'll foul up the flow sensor and send poor signals to the control panel, depending on the brand of tankless as to what gets screwed up from there, if it's a Bosch just write it off and start over again.
__________________
A flush is better than a full house.
KillerToiletSpider is online now  
Old 01-05-2010, 10:08 PM   #16
Capra aegagrus
 
Tinstaafl's Avatar
 
Trade: Remodeler
Join Date: Jan 2008
Location: Central Pennsylvania
Posts: 16,319
Rewards Points: 3,584

Re: Tankless Water Heater Freezing


All righty then. So actually, it would work; you'd just kill the heater.

That's totally astounding. I'm not doubting your word, but it sounds about on a par with "government intelligence" that any mfg would produce a unit so easily fouled up.

You just murdered any slight tickle of an urge I might have had to try one out.
Tinstaafl is online now  
Old 01-05-2010, 10:11 PM   #17
Working
 
Cole82's Avatar
 
Trade: GC
Join Date: Nov 2008
Location: Cedar Rapids, IA
Posts: 4,065
Rewards Points: 2,122
Send a message via AIM to Cole82

Re: Tankless Water Heater Freezing


Why do the Bosch ones slow the flow down so much?
I have installed 3 TL water heaters and 2 of the customers made me take them out. They were all bosch.
__________________
Cole's Custom Creations
Cedar Rapids, Iowa

The boss of awesome
Cole82 is offline  
Old 01-05-2010, 10:17 PM   #18
The Grand Wazoo
 
KillerToiletSpider's Avatar
 
Trade: It blowed up real good!
Join Date: May 2007
Location: Illinois
Posts: 3,714
Rewards Points: 1,454

Re: Tankless Water Heater Freezing


Quote:
Originally Posted by Cole82 View Post
Why do the Bosch ones slow the flow down so much?
I have installed 3 TL water heaters and 2 of the customers made me take them out. They were all bosch.

Because they are cheap, poorly engineered pieces of crap.

You get what you pay for.
__________________
A flush is better than a full house.
KillerToiletSpider is online now  
The Following 2 Users Say Thank You to KillerToiletSpider For This Useful Post:
ARealplumber (01-05-2010), Cole82 (01-05-2010)
Old 01-05-2010, 10:26 PM   #19
Pro
 
ARealplumber's Avatar
 
Trade: plumbing
Join Date: Aug 2009
Posts: 100
Rewards Points: 75

Re: Tankless Water Heater Freezing


Quote:
Originally Posted by KillerToiletSpider View Post
You'll foul up the flow sensor and send poor signals to the control panel, depending on the brand of tankless as to what gets screwed up from there, if it's a Bosch just write it off and start over again.
All you would need to do is have one faucet running to keep water moving through the water heater. This would be no different than a few dripping faucets added up. I've never heard that letting afaucet drip or run alittle with a tankless would foul the flow sensor. What manufacturer's users guide says this?
ARealplumber is offline  
Old 01-05-2010, 10:29 PM   #20
The Grand Wazoo
 
KillerToiletSpider's Avatar
 
Trade: It blowed up real good!
Join Date: May 2007
Location: Illinois
Posts: 3,714
Rewards Points: 1,454

Re: Tankless Water Heater Freezing


Quote:
Originally Posted by ARealplumber View Post
All you would need to do is have one faucet running to keep water moving through the water heater. This would be no different than a few dripping faucets added up. I've never heard that letting afaucet drip or run alittle with a tankless would foul the flow sensor. What manufacturer's users guide says this?

None of them.

I used to work for a shop that was an authorized Bosch repair company though.

__________________
A flush is better than a full house.
KillerToiletSpider is online now  


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Supplying hot water to 4 apartments joesauers Plumbing Picture Post 8 03-30-2009 07:18 AM
Bosch tankless hot water freeze-up Doug161 Plumbing 7 01-14-2009 11:39 PM
Water Heater noises & air sputtering at faucets LarryS Plumbing 10 01-10-2009 09:41 PM
tankless water heaters plumberboy General Discussion 27 10-13-2008 06:14 PM

Join Now... It's Fast and FREE!

I am a professional contractor
I am a DIY Homeowner
Drywall Talk is for
PROFESSIONAL CONTRACTORS ONLY!

At DrywallTalk.com we cater exlusivly to professional contractors who make their living as a contractor. Knowing that many homeowners and DIYers are looking for a community to call home, we've created www.DIYChatroom.com DIY Chatroom is full of helpful advices and perfect for DIY homeowners.

Redirecing in 10 seconds
No Thanks
terms of service

Already Have an Account?