Mighty Therm LO-NOx Volume Water Heater
Page 3
V
Vent Cap
Drafthood
W
10 1/4
26
16 1/2
41.9
10
25.4
8
20.3
5 1/4
13.3
3 1/2
9
GAS CONNECTION
FAR SIDE
14 3/4*
37.5
38*
96.5
Front View
Side View
30 1/2*
77.5
Pump
H
LAARS
LO-NOx
MIGHTY THERM
MIGHTY THERM
SECTION 1.
General Information
1.1 Introduction
This manual provides installation, operating, and
maintenance instructions for Model VW-PW Volume
Water Heaters, Sizes 250 and 400. Review all
application and installation procedures completely
before proceeding with the installation. Experience has
shown that most operating problems are caused by
improper installation.
The heaters are offered in a basic configuration
(see Figure 1). On PW heaters, a factory-supplied
pump is mounted on the unit. PW models are not
available for hard water applications. There is no pump
mounted on VW units. Pump for VW units is to be
field-supplied.
WARNING
Mighty Therm water heaters must be installed in
accordance with the procedures detailed in this
manual, or the Laars Heating Systems warranty will
be voided. The installation must conform to the
requirements of the local jurisdiction having
authority, and, in the United States, to the latest
edition of the National Fuel Gas Code, ANSI
Z223.1. In Canada, the installation must conform to
the latest edition of CAN/CGA-B149.1 Natural Gas
Installation Code and/or local codes. Any
modifications to the boiler, its gas controls, or wiring
may void the warranty. If field conditions require
modifications consult the factory representative
before initiating such modifications.
Figure 1. General Configuration.
All dimensions are nominal.
Dimensions shown in
inches centimeters
NOTE:* For outdoor models, add 6 inches (15.2cm) for
outdoor base.
Venting Dimensions
Model
Firing
Heater
Drafthood Vent
Outdoor
Indoor
Size
Rate
Width
Vent Cap Diameter
Dim
Dim
“W”
“V”
“H”
“H”
Btu/hr
kW
in
cm
in
cm
in
cm
in
cm
(1000's)
250
250
73.3
22 1/2
57.2
7
17.8
18 1/4
46.4
25 1/4
64.1
400
399
117.0
31 3/4
80.6
9
22.9
21 1/2
54.6
27 1/2
69.9
OUT OF
PRODUCTION
