NORMAL OPERATION - GSWH-1M
The Girard Tankless Water Heater (M-Series), also referred to as an “on demand” water heater,
rapidly heats water as it flows around and through the heat exchanger. The output water
temperature depends on the temperature of the incoming water and the flow established at the
faucet and the dial setting.
Water flow is critical since the SLOWER the water flows (through the heat exchanger), the
HOTTER the water temperature and the FASTER the water flow, the COOLER the water
temperature.
The BTU adjustment for the M-Series water heater operates through a modulator rather than
the gas valve. The modulator control increases the amount of gas flow to the burners as the dial
is turned from LOW to HIGH. On the LOW setting, the water heater operates at approximately
18,000 BTUs. On the high setting, approximately 36,000 BTUs. The LOW setting will increase
the water temperature by approximately 20° F from the input water temperature. Placing the
dial on the HIGH setting will increase the water temperature by approximately 70° F depending
on the input water temperature. A thermostat setting may vary +/-5° F - The ECO setting 131°.
Later models with dual ECO/High Limit 131°/167° resetable.
Prior to Operation
The end user/technician must insure that all air has been purged from all on-board water lines.
To purge the system (purging procedure needs to be done at the beginning of the camping
season or if any water line is evacuated / drained of water)
1. Verify the switch is in the (Off) position.
2. Turn on the water supply to the unit.
3. Open and then close all the HOT and COLD water faucets at the kitchen, bathroom,
inside shower, toilet, outside shower, washer (if equipped) and any other inside or outside
faucets.
4. Close the faucets when the water is flowing smoothly.
5. Check for any noticeable water leaks.
6. Confirm the LP gas is turned on.
7. Turn the power switch to the ON position. This switch can be left ON during the entire
camping season. This will not harm the unit in any way.
8. Open a hot water faucet to verify that the unit ignites and supplies warm water.
Operating the Water Heater
To start the water heater the user/technician should fully open the hot water faucet and
wait for the water to become warm. The water will become warm as soon as the water from
the water heater reaches the faucet. Thus, the distance of the water heater from the faucet
determines how long it will take for the water to become warm. When a change is made in water
temperature or flow, the distance will also effect this time. As a technician, you will notice that
even when the water heater is close to the faucets, sometimes the routing of the water lines
might not be a direct line.
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