Tankless Water Heater Gas Line Requirements

Today tankless water heater energy factors range between 64 and 91 for gas fired models and up to 99 for electric models.

Tankless water heater gas line requirements.

Pressure drop in table 2. Ask your gas provider about the size of your gas main. Restrictions on gas fueled tankless water heaters no gas appliance may be located in a room used. The minimum gas line size is inside diameter.

Turn off the water gas supply valves and power. For both gas and electric models a tankless water heater s overall energy efficiency is measured using an energy factor ef rating. Electrical even gas water heaters have electrical parts and need to be hooked up to your breaker box. The same appliance would require just a pipe size based on table 4 the 3 0 in w c.

Tankless water heaters usually need more gas than even the biggest home furnaces. Drain and disconnect the old water heater. Ideally to maintain the water temperature required by all of these functions at the same time your requirements are a tankless water heater that is capable of raising the temperature of the water. 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.

Ok so san jose has the following requirements for where to install the tankless water heater. Because tankless units heat water on demand they require higher btus or they operate on high heat. This ef rating is based on test procedures developed by the u s. Rinnai tankless water heaters are designed to provide maximum performance and efficiency.

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. 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. To heat the water quicker and more efficiently tankless water heaters operate with higher btus and require a minimum gas line. This does not mean that a tankless water heater uses more gas.

Vent termination all tankless water heater vents must terminate at least 4 feet from a property line.