Tankless Water Heater Plumbing Requirements

Determine the mounting space.

Tankless water heater plumbing requirements.

Determine your water flow rates. If reticulating pump in system. 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 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.

How to determine the required size of a tankless hot water heater. 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. Once you have your total flow rate and the required temperature rise you can find the right size tankless water heater for your home. If you use less than 41 gallons of hot water per day a tankless heater is 24 34 more efficient than a tank style heater.

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. Measure your cold water temperature. 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. I e rinnai requires 120 vac and 60 hz from the adequately grounded circuit.

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. Insulation is applied to the entire loop. Tankless water heaters should not be installed near dryer vents or intake air vents. Many water heaters especially traditional electric ones require changes to your wiring and potentially the breaker box.

Tankless water heaters are much smaller than units with a storage tank allowing them to be wall mounted. When installing a tankless water heater the us and canada keep in mind to check out the electrical specs from the manufacturer s instructions. The specifications for each model are listed on this website. For example taking a shower and running the dishwasher at the same time might stretch a tankless water heater to its limit.

If the window does not open the tankless water heater clearance from a window requires a 12 inch setback. Beyond a water heater permit some areas may also require either an electric or plumbing permit depending on the type of water heater.