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For Low Pressure Steam Service

Note:

 When used for Steam Service, BE SURE to use pigtail to prevent 

live steam from damaging No. N36-M1.

Maximum Steam Pressure:

15psi (103.4 kPa).

Maximum Temperature:

250°F (121°C).

IS-N36-M1  0914 

EDP# 1910930 

© Watts 2009

Wa t e r   S a f e t y   &   F l o w   C o n t r o l   P r o d u c t s 

USA:

  815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com

Canada:

  5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca

Watts No. 

N36-M1

Watts No. 

N36-M1

Trap

Trap

Trap

Jacketed 

Kettles

Unit Heaters

Pigtail

Pigtail (Not 

needed for 

pressure 

under 5 psi).

Watts No. 

N36-M1

Low Pressure Steam Heating Systems

Pigtail

Pigtail

Zone Control 

Valves

N36-M1 should be 

installed on supply 

main on system 

side of control 

zone valve.

Air Vents

Watts No.  

N36-M1

Steam Coil Heaters

Pigtails

Heating Coil

Steam Trap

Temp. 

Regulator

Alternate Installation

T&P Relief  

Valve

IS-N36-M1

Series N36-M1 and 

Series LFN36-M1

Installation Instructions for Water Service

Install No. N36-M1 in cold water supply line with or above the highest point in the tank.
No. N36-M1 must be installed vertically in an upright position as shown. No valve 

is to be placed between the relief valve and the tank. Illustrations show typical 

and correct positions. Valve opens on vacuum of not over 

1

2

" mercury column. 

Maximum working pressure: 200psi (13.8 bar). (Maximum steam working pressure: 

15psi or 103 kPa.) Maximum temperature: 250°F (121°C).

Caution:

 Not Suitable for Cross-Connection Control.

Table Top Heaters

Watts No. 

N36-M1

Cold

T&P Relief 

Valve

Domestic Hot Water Supply Tanks 

and Heaters with Top Supply

Watts No. 

N36-M1

Tank

Hot

Cold

T&P Relief 

Valve

Domestic Hot Water Supply Tanks and 

Heaters with Bottom Feed

Watts No. 

N36-M1

Tank

T&P Relief 

Valve

Hot

Cold

Limited Warranty:

 Watts Regulator Co. (the “Company”) warrants each product to be free from defects in material and workmanship under 

normal usage for a period of one year from the date of original shipment.  In the event of such defects within the warranty period, the Company 

will, at its option, replace or recondition the product without charge.  

THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY THE COMPANY WITH RESPECT TO THE 

PRODUCT.  THE COMPANY MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED.  THE COMPANY HEREBY SPECIFICALLY DISCLAIMS 

ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY 

AND FITNESS FOR A PARTICULAR PURPOSE.

The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach of warranty, and the 

Company shall not be responsible for any incidental, special or consequential damages, including without limitation, lost profits or the cost of 

repairing or replacing other property which is damaged if this product does not work properly, other costs resulting from labor charges, delays, 

vandalism, negligence, fouling caused by foreign material, damage from adverse water conditions, chemical, or any other circumstances over 

which the Company has no control.  This warranty shall be invalidated by any abuse, misuse, misapplication, improper installation or improper 

maintenance or alteration of the product.  

Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion or limitation of 

incidental or consequential damages.  Therefore the above limitations may not apply to you.  This Limited Warranty gives you specific legal 

rights, and you may have other rights that vary from State to State.  You should consult applicable state laws to determine your rights.  

SO 

FAR AS IS CONSISTENT WITH APPLICABLE STATE LAW, ANY IMPLIED WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE 

IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR 

FROM THE DATE OF ORIGINAL SHIPMENT.

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