AO Smith "new" Water Heater - What Is The "R" Value? - Plumbing - DIY Home Improvement | DIYChatroom

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


Thread Tools Display Modes
Old 07-21-2009, 02:59 PM   #1
Join Date: Jul 2009
Posts: 2
Rewards Points: 10

AO Smith "new" Water Heater - what is the "R" value?

Read to purchase a new 50 gallon AO Smith (gas) Promax Powervent Water heater but unclear about various models and what "r" value ? Think it is the insulation factor? Getting variety or price quotes from plumbers - but wonder if "r" value impacts price - - - hard to compare apples to apples unless I get specific Model Numbers since there appear to be a few for the 50 gallon product. Can anyone enlighten me as also, is there a big difference between an R=8, R=16 or R=12 (and will that impact price?)


Lesdeak is offline   Reply With Quote
Old 07-23-2009, 07:43 AM   #2
Join Date: Nov 2007
Location: Nashua, NH, USA
Posts: 7,966
Rewards Points: 1,538

R value refers to the insulation between the tank and the outer shell. Yes, a higher R-value will mean a more expensive heater, all other things being equal since the layer of insulation is thin, like one inch, and high R-value materials (foam) for that thickness cost more.

I don't have any figures on how long it takes the tankful of water to cool down (and then require re-heating) for a given R-value.

There are usually metal fins in the central flue that capture additional heat from the exhaust gases to heat the water from inside. But when the burner shuts off, air continues to flow up the middle and cool down the water. The most modern gas water heaters also have a flue damper to stop air from rising through the middle. This is also an added cost component.

If your heater has a low R-value, you you may be able to add a blanket of insulation yourself. Some restrictions apply for non-electric heaters as the blanket must be non-combustible and not block the flow of oxygen.


The good conscientious technician or serviceperson will carry extra oils and lubricants in case the new pump did not come with oil or the oil was accidentally spilled, so the service call can be completed without an extra visit.

Last edited by AllanJ; 07-23-2009 at 07:52 AM.
AllanJ is offline   Reply With Quote

ao smith , powervent , r value , water heater

Thread Tools
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
Water Heater Problems martyshel Electrical 4 01-24-2009 12:07 AM
Multiple hot water heater issues a-6intruder Plumbing 8 01-16-2009 05:58 PM
Water Heater tsmith Plumbing 10 12-01-2008 06:24 PM
Water Heater Troubles deadguydrew Plumbing 9 10-19-2008 09:30 AM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1