Site Preparation
To install on carpeted area you must install a metal or wood panel under the water heater that
extends at least 3 inches beyond the width and depth of the unit. If water leakage can result in
damage to the adjacent area, install a drain pan that can be drained to outside of the vehicle,
under the water heater.
Verify that a clearance of 1 inch will remain after installation between the top surface of the
water heater and any combustible material. 0 inch clearance is acceptable for the sides.
Make sure that the front edge of the opening is surrounded by a solid frame to firmly anchor the
water heater; if needed, build an appropriate frame using 2” X 2” elements (Figure 1)
The rough opening for the GSWH-1M should be 12.75” X 12.75” with right angle corners. The
exterior wall opening must be the same dimensions with no radius corners.
Water Heater Installation
Remove the water heater from the box by grasping the metal sides of the housing and lifting
upward until it is free of the box.
5
P a g e
Ensure that water and gas connections from
the vehicle are in place for installing the
unit. Allow sufficient length and flexibility
in the water and gas lines to reach the
connections while the unit is partially
inserted into the opening.
Figure 1
IMPORTANT!
• Lifting or moving the water heater using the Blower Assembly Support
Bracket/Exhaust Tube (Figure 1) may result in improper alignment of the vent
and/or improper alignment of the Sail Switch.
