Tankless Water Heater Requirements

How to determine the required size of a tankless hot water heater.

Tankless water heater requirements.

Determine the mounting space. For a household of one or two people a tankless electric unit will probably be adequate. This is as easy as heading down to the local planning or building department to ask for one. Simply locate the appropriate water heater sizes on ecomfort using your information.

With a condensing tankless water heater you don t need metal venting. For homes that use 41 gallons or less of hot water daily demand water heaters can be 24 34 more energy efficient than conventional storage tank water heaters. Restrictions on gas fueled tankless water heaters no gas appliance may be located in a room used. Tankless water heaters are much smaller than units with a storage tank allowing them to be wall mounted.

Non condensing tankless water heaters typically transfer to the water only about 80 percent of the heat they generate. You re only looking at 20 to 100 out of pocket as opposed to several hundred dollars to call in a plumber. Tankless water heaters can be 8 14 more energy efficient for homes that use a lot of hot water around 86 gallons per day. Determine your water flow rates.

Around the water heater. As a general rule any gas heater which is tankless uses combustion air must have a minimum area of 10 000 cu. Enclosed areas just as closets might need air ducts and extra air inlets. The first permit is for the water heater itself.

Measure your cold water temperature. Today tankless water heater energy factors range between 64 and 91 for gas fired models and up to 99 for electric models. The models which need combustion air from the outside are required to have a second hose which is supposed to be put in. The remaining heat creates a hot exhaust gas that requires metal venting typically stainless steel or thick aluminum.

Once you have your total flow rate and the required temperature rise you can find the right size tankless water heater for your home. The higher the energy factor the more efficient the water heater. How much does a water heater permit cost.