Tankless Water Heater Gas Line Requirements

Tankless water heaters usually need more gas than even the biggest home furnaces.

Tankless water heater gas line requirements. For both gas and electric models a tankless water heater s overall energy efficiency is measured using an energy factor ef rating. Ok so san jose has the following requirements for where to install the tankless water heater. You can see that in a typical gas system a tankless water heater with a capacity of 199 900 btu will require a 1 inch pipe size for a 20 ft branch length based on the 0 3 in w c. Turn off the water gas supply valves and power.

Because tankless units heat water on demand they require higher btus or they operate on high heat. Electrical even gas water heaters have electrical parts and need to be hooked up to your breaker box. 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. To heat the water quicker and more efficiently tankless water heaters operate with higher btus and require a minimum gas line.

Drain and disconnect the old water heater. Vent termination all tankless water heater vents must terminate at least 4 feet from a property line. The same appliance would require just a pipe size based on table 4 the 3 0 in w c. You may have to run new larger gas pipe from your gas meter.

Pressure drop in table 2. Restrictions on gas fueled tankless water heaters no gas appliance may be located in a room used. This ef rating is based on test procedures developed by the u s. Plumbing the most important skill is needed for working with both gas and water lines installing fixtures and ensuring there are no potential leaks or pressure issues.

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. The minimum gas line size is inside diameter. Today tankless water heater energy factors range between 64 and 91 for gas fired models and up to 99 for electric models. Rinnai tankless water heaters are designed to provide maximum performance and efficiency.

Ask your gas provider about the size of your gas main.