Tankless Water Heater Gas Line Requirements

Turn off the water gas supply valves and power.

Tankless water heater gas line requirements.

This ef rating is based on test procedures developed by the u s. Ok so san jose has the following requirements for where to install the tankless water heater. Rinnai tankless water heaters are designed to provide maximum performance and efficiency. Electrical even gas water heaters have electrical parts and need to be hooked up to your breaker box.

Today tankless water heater energy factors range between 64 and 91 for gas fired models and up to 99 for electric models. Vent termination all tankless water heater vents must terminate at least 4 feet from a property line. Because tankless units heat water on demand they require higher btus or they operate on high heat. 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.

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. 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.

Drain and disconnect the old water heater. Tankless water heaters usually need more gas than even the biggest home furnaces. This does not mean that a tankless water heater uses more gas. Ask your gas provider about the size of your gas main.

Pressure drop in table 2. You may have to run new larger gas pipe from your gas meter. For both gas and electric models a tankless water heater s overall energy efficiency is measured using an energy factor ef rating. A gas dryer cooktop together probably add up to 50 70 000btu hr the water heater is 180 000 so you need a minimum of 250k of capacity on a line that s shared and any tees off to the other load is best located within a couple feet of the meter regulator.

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.