For proper water recirculation you ll need the following units.
Water heater recirculation pump tankless.
The rheem rtgh is one of example of a unit with a built in recirculation pump.
These beneficial systems keep a steady supply of hot water ready for those moments when you need hot water immediately like a cold winter morning.
If you want to see an example you should check out the rheem rtgh unit which uses an integrated recirculation pump.
Water heater and pump.
The new recirculation pump kit from rheem provides immediate hot water using the tankless water heater controls.
Uses water heater electrical outlet no new electrical outlets required.
This can be a tankless water heater with an integrated recirculation pump or a water heater and an external pump.
A timer setting can be activated to run every so often for example every 30 minutes to keep hot water flowing through the homes pipes and ready when needed.
Pump installs by water heater not under a sink in a bathroom or kitchen.
Also the pump could work internally or externally.
The following table compares a tankless water heater without a hot water circulation system column a to one with waterquick tankless column b.