Does a tankless water heater need at and P valve?
Gas-fired tankless water heaters will usually require a pressure relief valve, while electric on-demand water heaters may not. The manufacturers typically only require a pressure relief valve, not the combination temperature and pressure relief valve that is necessary for tank-type water heaters.
Why does my Rinnai tankless water heater go cold?
Your tankless water heater will feel cold to the touch when the heater unit and pumps are in the rest state and not heating water. There’s nothing to worry about. As long as everything is working properly (e.g. you have hot water on demand), there is no cause for concern.
What is an isolation valve kit for tankless water heater?
Manufacturers call it an “isolator valve kit” or “service valve kit,” and plumbers often just say “flush kit.” It’s a set of four valves, two each on the hot and cold water pipes below a tankless water heater, that enables you or a service person to flush out any mineral scale buildup inside.
What are isolation valves on a tankless water heater?
This compact isolation valve is designed to provide easy installation and maintenance of tankless water heaters. The lead-free valve is used for isolation, purging, draining, and pressure relief.
Is there a pressure relief valve on a tankless water heater?
Pressure-relief valves are an essential component of tankless water heaters. The valves allow you to manually release air from the heating chamber when filling the chamber with water for the first time, or during periodic maintenance.
Does a tankless water heater need a thermal expansion tank?
Does a tankless water heater require a thermal expansion tank? No. According to the 2018 International Plumbing Code (IPC) section 608.3, tankless water heaters do not require a thermal expansion tank when no water storage device is used.
Why is my tankless water heater running out of hot water?
One of the most common reasons that your tankless hot water stops working in the shower is because your current unit can’t supply enough hot water per minute. If you’re attempting to do the laundry, run the dishwasher, and shower at the same time, then you’re likely straining your on-demand water system’s capabilities.