Bosch GWH-345/450-ESR-N User Manual

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Attention residents of the Commonwealth of 
Massachusetts:
In the Commonwealth of Massachusetts the following 
regulation went into effect on 12/30/2005:
(a)For all side wall horizontally vented gas fueled 
equipment 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:

1. INSTALLATION OF CARBON MONOXIDE 
DETECTORS. At the time of installation of the side wall 
horizontal vented gas fueled equipment, the installing 
plumber or gasfitter 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 gasfitter 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 side wall 
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.
a. 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.
b. 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, 
however, that during said thirty (30) day period, a 
battery operated carbon monoxide detector with an 
alarm shall be installed.

2. 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 IAS 
certified.

3. 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".

4. INSPECTION. The state or local gas inspector of the 
side wall horizontally vented gas fueled equipment shall 
not approve the installation unless, upon inspection, the 
inspector observes carbon monoxide detectors and 
signage installed in accordance with the provisions of 
248 CMR 5.08(2)(a)1 through 4.
(b)EXEMPTIONS: The following equipment is exempt 
from 248 CMR 5.08(2)(a)1 through 4:
1. The equipment listed in Chapter 10 entitled 
"Equipment Not Required To Be Vented" in the most 
current edition of NFPA 54 as adopted by the Board; 
and
2. Product approved side wall horizontally vented gas 
fueled equipment installed in a room or structure 
separate from the dwelling, building or structure used in 
whole or in part for residential purposes.
(c)MANUFACTURERS REQUIREMENTS - GAS 
EQUIPMENT VENTING SYSTEM REQUIRED. When 
the manufacturer of Product Approved side wall 
horizontally mounted gas equipment provides a venting 
system design or venting system components with the 
equipment, the instructions provided by the 
manufacturer for the installation of the equipment and 
the venting shall include:
1. Detailed instructions for the installation of the venting 
system or the venting system components: and
2. A complete parts list for the venting system design or 
venting system.
(d)MANUFACTURER REQUIREMENTS - GAS 
EQUIPMENT VENTING SYSTEM NOT PROVIDED. 
When the manufacturer of a product approved side wall 
horizontally vented gas fueled equipment does not 
provide the parts for the venting of flue gases, but 
identifies "special venting systems," the following 
requirements shall be satisfied by the manufacturer:
1. The referenced "special venting system" instructions 
shall be included with the appliance or equipment 
installation instructions; and
2. The "special venting systems" shall be product 
approved by the Board, and the instructions for that 
system shall include a parts list and detailed installation 
instructions.
(e) A copy of all installation instructions for all products 
approved side wall horizontally vented gas fueled 
equipment, all venting instructions, all parts lists for 
venting instructions, and/or all venting design 
instructions shall remain with the appliance or 
equipment at the completion of the installation.