Gas fuelled Tankless Water Heater Models

The most famous brands are Bosch and Rheem.
In the next sections I will present some individual models like
- Rheem 53XP Outdoor Tankless Water Heater
- Rheem Outdoor 74X Tankless Water heater
- Bosch 2400E Tankless Water Heater
- Bosch 1600H Hydro Power Tankless Water Heater