Water Pressure Needed For The Fogatti RV Tankless Water Heater

Question:

I have read several comments here and elsewhere about problems with water pressure for a tankless water heater in an RV. I only boondockinch and never hook up to pressured water at RV parks. I always just fill my fresh water tank. The tank is pressurized with a ShurFlow water pump, only 1-year old. I do notice some pulsating of the water pump and water flow when I shower, for instance. What causes the problems with water pressure in a tankless water heater? Will it operate without problems using fresh water tank and water pump? Is there anything else I need to know/expect if I try to use a tankless water heater when boondocking? Thanks for your guidance and assistance.

asked by: J.E. S

Helpful Expert Reply:

The Fogatti RV Tankless Water Heater - Gas - Automatic Pilot - 41,800 Btu - Black Item # LSB44FR requires a cold water inlet pressure of 14.5~116PSI to properly operate. If your tank with ShurFlow water pump can support this you'll have no issues. If you're having water pressure issues from the water heater then you'll need to increase the PSI (while still within the 116PSI maximum) by adjusting your pump or using a water regulator like the Valterra Adjustable Water Regulator for RVs - Brass - Lead-Free # A01-1117VP. Too low of a PSI would cause the "pulsating" you described.

Boondocking will limit your ability to shower or run the water for an extended amount of time as you'll run through your water quickly but you will be able to do it.

expert reply by: Kevin C