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Servicing should only be performed by a Qualied Service Agent
GENERAL INFORMATION
INSTALLATION REQUIREMENTS FOR THE COMMONWEALTH OF MASSACHUSETTS
For all side wall terminated, horizontally vented power vent, direct vent, and power direct vent gas fueled
water heaters installed in every dwelling, building or structure used in whole or in part for residential
purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent
termination is less than seven (7) feet above finished grade in the area of the venting, including but not
limited to decks and porches, the following requirements shall be satisfied:
INSTALLATION OF CARBON MONOXIDE DETECTORS
At the time of installation of the side wall horizontal vented gas fueled equipment, the installing plumber
or gas fitter shall observe that a hard wired carbon monoxide detector with an alarm and battery back up
is installed on the floor level where the gas equipment is to be installed. In addition, the installing plumber
or gas fitter shall observe that a battery operated or hard wired carbon monoxide detector with an alarm
is installed on each additional level of the dwelling, building or structure served by the sidewall horizontal
vented gas fueled equipment. It shall be the responsibility of the property owner to secure the services of
qualified licensed professionals for the installation of hard wired carbon monoxide detectors. In the event
that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the hard
wired carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent
floor level. In the event that the requirements of this subdivision can not be met at the time of completion
of installation, the owner shall have a period of thirty (30) days to comply with the above requirements
provided that during said thirty (30) day period, a battery operated carbon monoxide detector with an alarm
shall be installed.
APPROVED CARBON MONOXIDE DETECTORS
Each carbon monoxide detector as required in accordance with the above provisions shall comply with
NFPA 720 and be ANSI/UL 2034 listed and CSA certified.
SIGNAGE
A metal or plastic identification plate shall be permanently mounted to the exterior of the building at
a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the
horizontally vented gas fueled heating appliance or equipment. The sign shall read, in print size no less
than one-half (1/2") inch in size,
“GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS.”
GAS PRESSURE SPECIFICATIONS
MODELS
Natural
120‑150
Propane
120‑150
Natural
199‑250
Propane
199‑250
Natural
300/400/500
Propane
300/400/500
Maximum Gas
Supply Pressure
10.5" WC
(2.59 kPa)
14.0" WC
(3.45 kPa)
10.5" WC
(2.59 kPa)
14.0" WC
(3.45 kPa)
11.0" WC
(2.74 kPa)
14.00" WC
(3.49 kPa)
Nominal Gas
Supply Pressure
7.0" WC
(1.74 kPa)
11.0" WC
(2.74 kPa)
7.0" WC
(1.74 kPa)
11.0" WC
(2.74 kPa)
7.0" WC
(1.74 kPa)
11.0" WC
(2.74 kPa)
Minimum Gas
Supply Pressure
(Low Gas Press.
Switch Setting)
4.8" WC
(1.20 kPa)
11.0" WC
(2.74 kPa)
4.8" WC
(1.20 kPa)
8.5" WC
(2.12 kPa)
5.2" WC
(1.54 kPa)
11.0" WC
(2.74 kPa)
Manifold Pressure
4.0" WC
(0.98 kPa)
10.0" WC
(2.49 kPa)
0" WC
(0 kPa)
0" WC
(0 kPa)
4.00" WC
(1.25 kPa)
10.0" WC
(2.49 kPa)