The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Calling all Non-US members!! (Non-US only)
by aussie240
Today at 02:39 AM
Photo Upload Tutorial
by DanK
Yesterday at 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
Texas_Ranger 8
sparkyinak 7
Trumpy 6
Who's Online
1 registered (ampherder), 233 Guests and 5 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#21112 - 01/27/03 03:43 PM Water Heater or Boiler????
golf junkie Offline

Registered: 04/22/01
Posts: 511
Loc: 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

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#21113 - 01/27/03 04:55 PM Re: Water Heater or Boiler????
gramps Offline

Registered: 08/25/02
Posts: 120
Loc: ohio
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...

#21114 - 01/28/03 04:41 PM Re: Water Heater or Boiler????
John Steinke Offline

Registered: 04/03/01
Posts: 509
Loc: 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."

#21115 - 01/28/03 06:55 PM Re: Water Heater or Boiler????
golf junkie Offline

Registered: 04/22/01
Posts: 511
Loc: 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).]


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals