40 Model Comprehensive
Troubleshooting Guide
Eccotemp Systems, LLC
315a Industrial Rd. Summerville, SC 29483
www.eccotemp.com
1-866-356-1992
Listed below are some common questions and troubleshooting guidelines for our 40H/HI water heaters. Always remember
when working on a particular issue to ensure that the water heater is unplugged and the gas is shut off. Always seek
professional advice and assistance, if needed. Also, you are welcome to call Technical Support at 866-356-1992 or, for
fastest service, submit a support ticket by going to
www.eccotemp.com
and clicking on the “Support,” tab on the right side
of the page.
Basic Information:
The 40H and 40HI are gas powered tankless water heaters. After setting them to the desired temperature, they will self
adjust, based upon water flow, to maintain a desired temperature. They are designed for residential use for a 2 bath, 3
bedroom home. Though capable of achieving higher temperatures, it is recommended that you set the temperature at 120
degrees Fahrenheit or below.
General Questions:
Questions:
Q. I want to mount inside my camper or food truck?
A. Remember, the 40H and 40HI were designed for residential, not commercial, use. The 40HI is made to be mounted
indoors. However, DOT Regulations state that you cannot have a tankless water heater hooked to a gas supply line while
in motion. Once stationary, you can then hook up the gas supply and use your 40 model water heater.
Q. Can I use a 40H or 40HI with a portable propane tank and rubber hose?
A. Trying to use a 40H or 40 HI in this way will not meet building code, will reduce performance, can result in gas related
error codes, or damage to the water heater.
Q. Will it work on a 12v supply pump?
A. Yes, as long as your pump is capable of providing adequate water flow and water pressure. The 40 model water
heaters need a minimum of ¾GPM and 20PSI to operate.
Q. Can I use the 40H or 40HI with my existing plumbing?
A. The water heater has
½” NPT fittings so it is easily plumbed in to existing lines.
Q. Can I use this water heater to heat my swimming pool or hot tub?
A. You can use an 40H or 40HI to generate hot water for any application. Attempting to use it with a recirculation system
for an application like this will void your warranty and permanently damage your water heater.
Q. Can I use to this water heater in a recirculation system at all?
A. No, this will void your warranty and permanently damage your water heater.
Q. What size venting do I need for a 40HI?
A. The 40HI requires 3” Cat II/III stainless steel venting. Please check your local building code.
