Tankless Water Heater Plumbing Requirements

Typically hot water flows from a tankless heater at the rate of 2 5 gallons per minute and that may not be enough for several simultaneous uses of hot water in your household.

Tankless water heater plumbing requirements. Simply locate the appropriate water heater sizes on ecomfort using your information. When installing a tankless water heater the us and canada keep in mind to check out the electrical specs from the manufacturer s instructions. Measure your cold water temperature. Tempra series tankless water heaters are designed to use the same 208 240 volt current that your conventional electric tank type water heater uses however it will require a larger breaker and likely a heavier gauge of wiring.

Beyond a water heater permit some areas may also require either an electric or plumbing permit depending on the type of water heater. For example taking a shower and running the dishwasher at the same time might stretch a tankless water heater to its limit. Below we ve highlighted what size water heater you would need in our example of 6 5 gpm at a 63 f temperature rise. If the window does not open the tankless water heater clearance from a window requires a 12 inch setback.

Determine your water flow rates. Insulation is applied to the entire loop. The specifications for each model are listed on this website. How to determine the required size of a tankless hot water heater.

Tankless water heater vent clearances if the unit is vented to the outside then it needs 12 inches of clearance from a door or window. Tankless water heater pressure temperature relief valve safety requirements the temperature pressure relief valve lets water escape if the temperature or pressure is too high. If you use a lot of hot water around 86 gallons per day tankless water heaters are only 8 to 14 more efficient since they are running more often. This valve should be connected to a tube that discharges no more than six inches above floor level so hot water won t scald anyone nearby.

Many water heaters especially traditional electric ones require changes to your wiring and potentially the breaker box. Tankless water heaters should not be installed near dryer vents or intake air vents. I e rinnai requires 120 vac and 60 hz from the adequately grounded circuit. If reticulating pump in system.

Tankless water heaters are much smaller than units with a storage tank allowing them to be wall mounted. Determine the mounting space.