How Tankless Water Heaters Work
With a tankless water heater, cold water is heated only when needed, and it stays hot until you're done using it. The result is an endless supply of hot water and little to no wasted energy.
- A hot water fixture is turned on
- Tankless water heater senses the need for hot water
- Cold water enters the system
- Flame ignites and heats the heat exchangers
- Water preheats as it passes through the secondary heat exchanger
- Warm water continues to heat to desired temperature as it passes through stainless steel primary heat exchanger
- Hot water exits the unit and travels to the water fixture where it is needed
- Flame output adjusts as needed to maintain water temperature during use
- When hot water usage is complete, water stops flowing and the flame turns off
Tankless Buying Guide
Your Warm Welcome expert can help you select the right tankless water heater for your needs and expectations. Start with questions such as:
- Do I run out of hot water?
- Do I want to run multiple showers or do the laundry and wash dishes at the same time?
- Do I make the decision to do chores that require hot water strategically during different times of the day?
- Do I want a recirculation solution to get hot water faster?
- Location of installation: Rinnai tankless water heaters give you the flexibility to install on virtually any wall inside your home, not just in the utility room.
- Venting: Depending on placement within the home, interior models of Rinnai tankless water heaters can vent vertically through the roof or horizontally through an exterior wall.
- Gas Line Sizes: Rinnai tankless models are designed to provide maximum performance and operating efficiency using either a 1/2" or 3/4" gas line.
Rinnai Tankless Model Guide
Rinnai offers a broad range of models to meet the needs of any residential or commercial application.
| Model | Description | UEF Efficiency | Recirculation |
|---|---|---|---|
| HE | 15 models | 0.81 | |
| HE+ | 9 models | 0.81 | Ok w/ Circ-Logic™ |
| SE | 8 models | 0.90 | |
| SE+ RUR/RU | 24 models | 0.90 | Ok w/ Circ-Logic™ |
| SE+ RUR | 8 models | 0.90 | ThermaCirc360™ |
Our Featured Tankless Units
RSC199
Rinnai Tankless Water Heater
- 0.96 Energy Factor
- Up to 3 fixtures
- Indoor Only
- 15,200 to 199,000 BTU
RUR199
Rinnai Tankless Water Heater
- 0.96 Energy Factor
- Up to 3 fixtures
- Indoor Only
- 15,200 to 199,000 BTU
RL94
Rinnai Tankless Water Heater
- 0.82 Energy Factor
- Up to 3 fixtures
- Indoor Only
- 10,300 to 199,000 BTU
RL75
Rinnai Tankless Water Heater
- 0.82 Energy Factor
- 1 to 2 fixtures
- Indoor Only
- 10,300 to 199,000 BTU
Rinnai Hybrid Water Heaters
Rinnai Tankless Hybrid Water Heaters
RHS19980HEIN Demand Duo™
80 Gal Residential Hybrid
- 0.81 Uniform Energy Factor
- Natural Gas
- Indoor Only
- 10,300 to 199,000 BTU
RH180N
Natural Gas Hybrid Water Heater
- 0.80 Uniform Energy Factor
- Natural Gas
- Indoor Only
- 59,500 to 91,300 BTU
We're Your Local Rinnai ACE Dealers
We are proud to be recognized by Rinnai as one of the top tankless water heater dealers in Colorado. If your unit is showing a code, start with our Rinnai error code guide.
