• Welcome to the new and improved Building Code Forum. We appreciate you being here and hope that you are getting the information that you need concerning all codes of the building trades. This is a free forum to the public due to the generosity of the Sawhorses, Corporate Supporters and Supporters who have upgraded their accounts. If you would like to have improved access to the forum please upgrade to Sawhorse by first logging in then clicking here: Upgrades

Service piping vs. Mechanical System piping

Yankee

Registered User
Joined
Mar 31, 2010
Messages
1,344
Location
New England
2009 IECC

Sections 403.3 and 403.4 one type of piping has to have R3 and one has to have R2. I am not clear on what the difference is between these piping systems, as it seems that some mechanical piping is carring service water (as opposed to . . . other fluids).

Any thoughts?
 

Dr. J

Silver Member
Joined
Oct 19, 2009
Messages
367
Location
Colorado Front Range
Definition: SERVICE WATER HEATING. Supply of hot water for purposes other than comfort heating. This is intended to be domestic hot water (the stuff that comes out of a faucet - "domestic" isn't all that descriptive either). Unfortunately, this is ambiguous, and could mean things like snowmelt, or pool piping.

Thus hydronic heating piping to base board and underfloor radiant needs to be min R-3, while circulating domestic hot water, snow melt, and pool piping is min R-2.
 

Yankee

Registered User
Joined
Mar 31, 2010
Messages
1,344
Location
New England
Ok, thanks, , I found a definition for service water, but didn't see the "service water heating".

Seriously, there probably really isn't much difference between r2 and r3, maybe they should just pick one number for both.
 

peach

Registered User
Joined
Oct 17, 2009
Messages
2,834
Location
metro DC
service is usually the public, potable water service to the building.. mechanical service piping is generally self contained (process water or other fluids).
 
Top