Q Do relief valves explode?
NO. The pressure vessel explodes. Every article ever written describes the pressure vessel explosion.

So doesn’t the SPR protect my relief valve?
NO. The SPR protects the pressure vessel.

Isn’t my system safe, since most codes stipulate that a drainage line shall terminate in a plain end?

The code was based on the assumption that a plain end could only be modified by a qualified contractor who could solder a copper plug on the end. It was assumed a qualified contractor would NOT
do such a thing, and therefore, the system was protected from such tampering.

However, the reality of today is that a plain end does NOT prevent tampering by the common man. With the invention of push-on fittings (Sharkbite, etc), available at any hardware store, it is now
EXTREMELY easy for the common man to plug the system and create an unsafe environment for occupants and property.

With a NPT thread at the top, and plain end on the bottom, what is the current value of a DRAIN LINE?

Zero. The drain line presents no protection against tampering, plugging, and incorrect piping. The 1993 ASME standard, and most codes, are now woefully inadequate. Whether it’s plain end or NPT
threads, both invite tampering by the common man.

If the SPR breaks-away, couldn’t there be a chance of damage?

Yes, but the alternative is the tank exploding. Much like an air bag deploying, there is potential for damage, but you live to tell about it.

Q The International Plumbing Code 504.4.1 states: “There shall not be a check valve or shutoff valve between a relief valve and the heater or tank served”.
Is the SPR a valve?

The SPR is NOT a valve, nor does it violate any code language. The SPR is a full bore (>3/4”) device that simply connects the relief valve and the drain line. The SPR is very similar to a Hose Bib Vacuum
Breaker. The HBVB is a unique device that protects a water system from hose threads tampering, just like an SPR protects a pressure
vessel system from tampering with the NPT threads.

Q What is the SPR warranty?
The SPR has a lifetime warranty. It will outlast the T&P valve and the water heater. However, when the T&P valve is changed, or the water heater is replaced, a new SPR will be needed.



21 Londonderry Turnpike
Hooksett, NH 03106



Phone: 800-807-9827
email: info@waterheatersafety.com
Water Heater Safety
Q: Where do I buy the WHID?

A: Call us at 1-800-807-9827 or Click Here to request pricing or more information through email.

Q: What is the warranty?

A: Internal parts are warranted for one year, body for five years. Click here for details

Q: Can I install without a torch?

A: Because the WHID does NOT require electricity, sensors, or drain pans, it has the lowest installed cost of any emergency shut-off. Professionals can
install a WHID in about an hour. It can even be done without a torch using push-fit fittings.
Click here for details

Q: What are the dimensions?   

A: The WHID is 10” long, and the check valve is 4.25” long. Click here for details

Q: Do I need a drain pan?  

A: No, a drain pan is NOT required for the WHID to activate. However, it is RECOMMENDED as a good plumbing practice.  

Q: Where should I place the thermal expansion tank?

A: Upstream (before) of the WHID. When thermal expansion occurs, the high pressure will actually travel through the check valve, into the sensing line,
back through the WHID and into the thermal expansion tank.
Click here for details

Q: What if code requires a vacuum relief valve on inlet?  

A: The WHID will still function and shut off the water. For best results, place the vacuum relief valve upstream of the WHID
Click here for details

Q: Is the WHID required by plumbing code?  

A: Plumbing Codes always refer to manufacturer’s instructions.
Click here for details

Q: What do the water heater manufacturers say about emergency shut-offs?   

A: From a manufacturer’s instructions:  “All water heaters will eventually leak”.  Followed by: “Unanticipated damage can be reduced or prevented by a
leak detector or water shut-off device.”
Click here for details

Q: Will my insurance cover a leak/flood?  

A: Maybe/Probably/Depends.  You need to read your policy, in depth. Know your policy! And if you’re in a condo, get specific details from the Condo
Management Company about the Associations responsibilities.
Read More

Q: If my WHID activates, can I reset it until it I can get the water heater replaced?

A: Yes. This is necessary to ensure why the WHID tripped (T&P valve, leak, etc.), Or when you NEED hot water, but have to wait for a new water heater
(Sunday afternoon, holiday, Friday night in a restaurant, etc.)
Click here for details

Q: Can I transfer my WHID when I replace the water heater?   

A: Yes. The WHID should be inspected, and re-built if needed (Rebuild Kit).  

Q: What about my T&P relief valve?

A: The T&P is a critical safety valve. Please follow manufacturer’s instructions, which require annual flip of the lever (which activates the WHID), and
removal and inspection of the T&P every three years. An SPR should be installed on the T&P to prevent tampering.
Click here for details

Q: How often should I test the WHID?   

A: Test when it’s installed to ensure it’s working properly, and then annually thereafter. Testing should be done more often in hard water conditions.
Click here for details

Q:  Should I be concerned with a low water situation in my water heater?

A: No. This is an in-depth topic, but water heater manufacturers have already incorporated numerous safeguards. Click here for details

Q: Will the WHID protect my home from a catastrophic rupture of my tank?   

A: Yes and no. If the tank ruptures, the WHID will shut the water to the tank, but the residual water in the tank (40 gallons, 60 gallons, etc.) will flood into
the building. Additionally, if a leak occurs in the piping before the WHID, or after the CHECK VALVE, the WHID will NOT activate.
Click here for details

Q: As a school department plumbing supervisor, should I be concerned with my water heaters?

A: Absolutely. Schools are at great risk. The water heaters are often hidden away in ceilings and dark closets. To compound the problem, Murphy’s Law
is clear: A leak will always occur over a holiday break when no one is around.
WHID FREQUENTLY ASKED QUESTIONS
SPR FREQUENTLY ASKED QUESTIONS
©2014 Towle Whitney LLC
ADDRESS:

21 Londonderry Turnpike,
Hooksett, NH 03106
CONTACT:

Phone: 800-807-9827
Email:
info@waterheatersafety.com
HOURS:

Monday - Friday
8:00am to 4:00pm