Tankless Water Heater Gas Inlet Size

Pipe size based on fixture units.

Tankless water heater gas inlet size.

Rinnai tankless water heaters are designed to provide maximum performance and efficiency using either a 3 4 or 1 2 gas line as long as sufficient gas flow is available. We have decided on purchasing the rinnai ru98i tankless water heater natural gas. Tankless water heaters are intended to heat potable drinking water only and the inlet water to a tankless unit should not be pre heated. Once you have your total flow rate and the required temperature rise you can find the right size tankless water heater for your home.

Simply locate the appropriate water heater sizes on ecomfort using your information. Just follow the three simple steps below to choose the right model and size you need. Looking to purchase a new tankless water heater but having trouble figuring out what size or model you need. We don t know of any specific minimum in the international building code irc or florida building code fbc but the sizing of water distribution pipes is based on a combination of fixture units which is a number assigned to different types of plumbing fixtures according to their likely water usage and the length of piping in the system.

I ve also briefly searched and learned that a re. Choose the right tankless electric water heater for you. And your temperature rise which is determined by your incoming water temperature subtracted from your hot water setting. What size tankless water heater depends on your gpm at peak hot water demand.

I checked another brand it too has a 3 4 inlet. Tankless water heater sizing guide for residential applications. Below we ve highlighted what size water heater you would need in our example of 6 5 gpm at a 63 f temperature rise. I live in boston so my groundwater temperature is around 47 f.

However this model has a 3 4 inlet. Gas tankless water heaters are able to produce a larger temperature rise per gpm than electric models. Rheem tankless electric water heaters make it easy to enjoy instantaneous continuous hot water space saving design and significant energy cost savings. Our builder has told us that we have to have a 1 2 gas inlet.

Most demand water heaters are rated for a variety of inlet temperatures.