Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 08-04-2012, 08:45 AM   #1
Member
 
Join Date: May 2011
Posts: 40
Rewards Points: 25
Default

Water Heater to Tankless


Hello all,

We have been having some problems recently with our water heater. The water heater is going on 6 years old. We want to replace it with a tankless water heater. What should I know before getting one installed? Questions I have are::: Is the venting that I currently have acceptable? What kind of wall space is needed? What other questions should I be asking?

Any help on this would be greatly appreciated.

Have a great day
Bob

Pleesehelpme is offline   Reply With Quote
Old 08-04-2012, 09:30 AM   #2
Experienced
 
Jackofall1's Avatar
 
Join Date: Dec 2010
Location: Southern Michigan
Posts: 2,822
Rewards Points: 2,000
Default

Water Heater to Tankless


The biggest issue with this conversion is the size of the gas line, many tankless need a minimum of 3/4" line to them and many time the line coming into the home is large enough.

Mark

__________________
When its all said and done there is usually more said than done
Jackofall1 is offline   Reply With Quote
Old 08-04-2012, 09:39 AM   #3
Member
 
Join Date: May 2011
Posts: 40
Rewards Points: 25
Default

Water Heater to Tankless


Thank you for your reply. The gas line to our current water heater is 3/4". I would say we are good there.
Pleesehelpme is offline   Reply With Quote
Old 08-04-2012, 09:41 AM   #4
Member
 
Join Date: May 2011
Posts: 40
Rewards Points: 25
Default

Water Heater to Tankless


Also the main gas line coming in is 1" which recuces to 3/4 feeding to the rest of the appliances in our home.
Pleesehelpme is offline   Reply With Quote
Old 08-04-2012, 09:47 AM   #5
Experienced
 
Jackofall1's Avatar
 
Join Date: Dec 2010
Location: Southern Michigan
Posts: 2,822
Rewards Points: 2,000
Default

Water Heater to Tankless


You have to look at system total load in CFH to evaluate your main, ventiing is dependant on unit size.
__________________
When its all said and done there is usually more said than done
Jackofall1 is offline   Reply With Quote
Old 08-04-2012, 10:25 AM   #6
Member
 
Join Date: May 2011
Posts: 40
Rewards Points: 25
Default

Water Heater to Tankless


Is there some type of chart to get the proper size for my home?
Pleesehelpme is offline   Reply With Quote
Old 08-04-2012, 10:38 AM   #7
I have gas!
 
Clutchcargo's Avatar
 
Join Date: Mar 2007
Location: Massachusetts
Posts: 1,781
Rewards Points: 1,014
Default

Water Heater to Tankless


Are you installing it yourself? The venting is an issue, most conventional water heaters vent into the chimney. I believe tankless vents straight through the wall. There are clear requirements in the installation manual. You should download it first, that would clear up any installation issues you may run across.
__________________
I tear things down and build them up.
Clutchcargo is offline   Reply With Quote
Old 08-04-2012, 11:17 AM   #8
Experienced
 
Jackofall1's Avatar
 
Join Date: Dec 2010
Location: Southern Michigan
Posts: 2,822
Rewards Points: 2,000
Default

Water Heater to Tankless


Quote:
Originally Posted by Pleesehelpme View Post
Is there some type of chart to get the proper size for my home?
Yes if you search you will find many, and as Clutch said venting could be an issue, need to follow the manufacturers recommended method of installation.
__________________
When its all said and done there is usually more said than done
Jackofall1 is offline   Reply With Quote
Old 08-04-2012, 11:37 AM   #9
Doing it myself
 
Alan's Avatar
 
Join Date: Apr 2006
Location: Crescent City, CA
Posts: 3,762
Rewards Points: 2,024
Send a message via AIM to Alan Send a message via MSN to Alan
Default

Water Heater to Tankless


Check out this thread

__________________
Journeyman Plumber
Alan is offline   Reply With Quote
Old 08-04-2012, 11:46 AM   #10
Member
 
Join Date: May 2011
Posts: 40
Rewards Points: 25
Default

Water Heater to Tankless


I have read in each of the manufacturers manuals that we are trying to decide on that Category III venting is required.
Pleesehelpme is offline   Reply With Quote
Old 08-04-2012, 01:12 PM   #11
Member
 
Join Date: Feb 2011
Location: Spring, TX
Posts: 121
Rewards Points: 75
Default

Water Heater to Tankless


Tankless heaters are great (gas...not electric).
Don't undersize and buy one too small for your needs. See the manufacturer websites for proper sizing.
I have had a Tagaki tankless for 9 1/2 years and it has never had any problems even with 2 showers and washing machine drawing hot water at same time.
George6488 is offline   Reply With Quote
Old 08-04-2012, 01:14 PM   #12
Member
 
Join Date: May 2011
Posts: 40
Rewards Points: 25
Default

Water Heater to Tankless


Clutch, After reading some of the manuals the venting depends on the unit. The unit we are looking at has top venting which can be redirected in any direction either up through the roof or out the side of the house. We would just have to use the proper venting by code.
Pleesehelpme is offline   Reply With Quote
Old 08-04-2012, 01:15 PM   #13
Member
 
Join Date: Feb 2011
Location: Spring, TX
Posts: 121
Rewards Points: 75
Default

Water Heater to Tankless


I vented my heater direct thru the roof plus a fresh air vent was also needed for my unit. I believe that most manufacturers recommend independent venting and not shared.
George6488 is offline   Reply With Quote
Old 08-04-2012, 01:20 PM   #14
Member
 
Join Date: May 2011
Posts: 40
Rewards Points: 25
Default

Water Heater to Tankless


Yes I would be installing this myself. I would have to run this independently because the current venting is shared with the furnace and is not the proper venting for the tankless. I just want to be sure I have all T's crossed and my I's dotted.
Pleesehelpme is offline   Reply With Quote
Old 08-04-2012, 03:38 PM   #15
Member
 
Join Date: Jan 2009
Location: WV
Posts: 2,943
Rewards Points: 2,066
Default

Water Heater to Tankless


I would mount the unit on an outside wall and vent it through the wall. The vent pipe for the things is quite expensive. I installed my tankless myself, and that's what I did. You do, however, need to be mindful of required distances from windows, doors, and overhangs. These vary by location. There will also need to be a 120V outlet nearby for the control circuitry.

md2lgyk is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
Tankless Water heater, worth it?? zacker HVAC 23 01-04-2012 11:34 AM
relocating water heater location going tankless bstinson Plumbing 2 12-07-2011 10:00 AM
water heater drip kdange1 Plumbing 5 05-04-2010 03:24 PM
Need to run gas line to Tankless Water Heater. anonymouscuban Plumbing 2 04-16-2010 02:56 PM
Tankless water heater - NEED HELP! LakersFreak Plumbing 39 11-16-2008 08:49 AM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.