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Pre-installation continued-
a)
b) When boiler output required to satisfy domestic hot
c)
2.
Non-Priority – Boiler output is divided between space
heating and domestic hot water heating. Delivery of
domestic hot water can be reduced during simultaneous
space and domestic hot water heating operations,
depending on such factors as boiler output, boiler over-
sizing, number of space heating zones calling for heat,
and the ratio of domestic hot water load to space heating
load.
This water heater must be located in an area where leakage of
the tank, water line connections, or the temperature and pressure
relief valve will not result in damage to the area adjacent to the
water heater or to lower floors of the structure. When such
locations cannot be avoided, a suitable drain pan must be
installed under the water heater. The drain pan depth must be
suitable for draining and collecting water. The drain pan can be
purchased from your plumbing professional. The drain pan must
be piped to an adequate drain. The piping must be at least 3/4
inch in diameter and pitched for proper drainage.
Component Location
Minimum Clearance from Combustible Materials
Top
Table 6 – Minimum Combustible Material Clearances
Non-Piping
Side
6"(15.2cm)
Boiler DOE heating capacity is 100,000 Btu per
hour or less, or
water demand is at least 50% of the boiler output
required to satisfy space heating demand, or
When an interruption in space heating can be
tolerated during a long domestic hot water draw.
Sides
0"
0"
Recommended Service Clearances
Front
(Aquastat)
30"(76.2cm)
Table 7 – Service Clearances
CAUTION
Front
0"
Rear
1"(2.5cm)
17
Rear
0"
Top
12"(30.5cm)
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