ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
MRI LED lights dimmer control replacement - wow!
by Potseal. 01/19/18 08:52 PM
VDE 0100 to introduce AFCIs
by sparky. 01/19/18 08:03 PM
Video: Inventor of the GFCI self-testing shocks
by Bill Addiss. 01/17/18 11:11 PM
FPE in Germany
by HotLine1. 01/17/18 07:07 PM
Fujifilm Recalls Power Adapter Wall Plugs
by Admin. 01/16/18 07:04 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 12 guests, and 13 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Water Heater or Boiler???? #21112
01/27/03 06:43 PM
01/27/03 06:43 PM
golf junkie  Offline OP
Joined: Apr 2001
Posts: 507
York, NE
When does a water heater become a boiler??

We are working on a 70,000 sq.ft. nursing home. There are two high temp, high capacity, gas fired "water heaters" that supply hot water for a commercial kitchen. I'm not sure yet if the domestic hot water is tempered off this supply or it may be completely separate.

The plumber had a boiler inspector on site last week and the inspector said that remote shutdowns will have to be provided for these "water heaters".....he called them boilers.

I have had to provide remote shutdowns for large boilers that provide building heat, but haven't had to do it for these smaller units. And of course in isn't engineered into this project so there were no rough-in's provided for the shutdowns.

When does a water heater become a boiler?? What is the difference?


Work Gear for Electricians and the Trades
Re: Water Heater or Boiler???? #21113
01/27/03 07:55 PM
01/27/03 07:55 PM
gramps  Offline
Joined: Aug 2002
Posts: 112
i'm not a plumber, but i seem to remember from years ago, aboard an oceanagraphic research vessel, (i was a ship's electrician, in another life), this difference was defined as "when the hot water heater becomes a "pressure vessel" with a test pressure certification as such, then its no longer a "heater", but is a "boiler". also, if memory serves me, it must be capable of maintaining a certain "saturation" temperature at a given "working" pressure.

hope this memory isnt as good as it was 30 years ago... [Linked Image]

Re: Water Heater or Boiler???? #21114
01/28/03 07:41 PM
01/28/03 07:41 PM
John Steinke  Offline
Joined: Apr 2001
Posts: 518
Reno,Nv., USA
Such items are defined, and generally regulated, by the American Society of Mechanical Engineers' "Boiler & Pressure Vessel Code." I suppose that, technically, ALL water heaters would be considered "low pressure boilers."

Re: Water Heater or Boiler???? #21115
01/28/03 09:55 PM
01/28/03 09:55 PM
golf junkie  Offline OP
Joined: Apr 2001
Posts: 507
York, NE
I was told by the GC today that anything larger than 200,000 BTU capacity is considered a boiler by building code.

He also said that after this limit was put into code many manufacturers went back and changed the nameplate ratings on their equipment to 199,000 BTU to avoid this requirement.


[This message has been edited by golf junkie (edited 01-28-2003).]


2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman


Member Spotlight
Atomic City, ID USA
Posts: 803
Joined: October 2004
Show All Member Profiles 
Top Posters(30 Days)
Admin 20
sparky 15
Potseal 15
Popular Topics(Views)
243,562 Are you busy
180,364 Re: Forum
170,842 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.014s Queries: 14 (0.003s) Memory: 0.9582 MB (Peak: 1.0888 MB) Zlib enabled. Server Time: 2018-01-20 14:52:25 UTC