Rheem or VancEpic? Tankless Water Heaters Compared in 2026
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
This rheem vs VancEpic tankless water heater comparison focuses on two distinct heating methods. Both units deliver precise temperature control within ±1°F and support multiple outlets for family use. The main difference lies in their energy source and physical design. Rheem offers an electric 18kW model, while VancEpic provides a natural gas unit with 110,000 BTU. You must choose based on your home’s available fuel lines and electrical capacity.
Key differences
| Aspect | Rheem 18kW 240V Electric Tankless Water Heater | VancEpic 4.8 GPM Natural Gas Tankless Heater |
|---|---|---|
| Fuel Type | Electric | Natural Gas |
| Flow Rate | 4.4 GPM | 4.8 GPM |
| Wattage / BTU | 18 kW | 110,000 BTU |
| Voltage | 240 V | not listed |
| Dimensions | 14.5 x 18.5 x 3.5 inches | 14.4 x 14.4 x 24.6 inches |
| Weight | 14.8 pounds | 25.4 pounds |
Which one should you choose?
Choose Rheem 18kW 240V Electric Tankless Water Heater if
- You need a compact unit that mounts vertically to save wall space.
- Your home has 240V electrical circuits but no natural gas line.
- You prefer a lighter device that is easier to handle during installation.
Choose VancEpic 4.8 GPM Natural Gas Tankless Heater if
- You require the highest flow rate for multiple simultaneous showers.
- You have a natural gas supply and want higher heating power.
- You value built-in safety features like freeze protection and child locks.
Verdict: Choose the Rheem if your electrical panel supports 240V and space is tight. Pick the VancEpic if you have natural gas and need slightly higher flow rates. Both provide stable temperatures, so your choice depends entirely on your home’s utility connections.
Rheem or VancEpic: Key Specs
Flow rate capacity
The VancEpic unit delivers a continuous flow of 4.8 gallons per minute. This higher output supports 3 to 5 water outlets simultaneously, making it suitable for larger households with multiple showers running at once. The Rheem model provides 4.4 gallons per minute. While slightly lower, this flow rate is sufficient for whole-house use in many settings. You should choose VancEpic if your household has high simultaneous demand. The Rheem unit is a solid choice if your usage patterns are less intense.
Fuel type
These heaters use completely different energy sources. The Rheem model is an electric unit that requires a 240-volt power supply and an 18 kW wattage connection. It relies on copper immersion heating elements. The VancEpic unit burns natural gas. It uses an AirBoost combustion system and a 110,000 BTU heat output. Your choice depends entirely on your home’s existing infrastructure. You cannot switch between them without significant electrical or gas line modifications. This is a fundamental difference in how each system operates.
Dimensions and size
Physical footprint matters for installation space. The Rheem electric heater is compact, measuring 3.5 inches in height, 14.5 inches in width, and 18.5 inches in length. It weighs only 14.8 pounds. The VancEpic gas unit is significantly larger and heavier. It stands 24.6 inches tall, with a width and depth of 14.4 inches. It weighs 25.4 pounds. If you have limited wall space or need a low-profile unit for a closet, the Rheem model is the clear winner. The VancEpic requires more vertical clearance.
Temperature control
Both manufacturers prioritize precision in water temperature. The Rheem features an external digital thermostatic control with an LED display. It maintains accuracy within plus or minus 1 degree Fahrenheit. The VancEpic unit also offers precise control within plus or minus 1 degree Fahrenheit. It uses intelligent gas and temperature linkage to adjust heating output automatically. Both units prevent sudden temperature fluctuations during use. Neither has a distinct advantage in temperature stability. You get consistent hot water from either device.
Heat exchanger build
The internal components differ in design. The Rheem uses durable copper immersion heating elements. These are field-serviceable, allowing for easier maintenance over time. The VancEpic utilizes an oxygen-free copper heat exchanger. This design aims for faster heat transfer and improved energy efficiency through its AirBoost combustion technology. Both use copper for conductivity and durability. The Rheem emphasizes serviceability, while the VancEpic emphasizes efficient combustion and heat transfer speed. Your preference depends on whether you value easy service access or advanced combustion efficiency.
Which tankless water heater fits your home?
Small household with existing 240V wiring
The Rheem unit runs on 240V electricity and draws 18 kW. It measures just 3.5 by 14.5 by 18.5 inches and weighs 14.8 pounds. This compact size fits tight spaces easily. Its 4.4 GPM flow rate handles daily tasks. The copper heating elements are field serviceable. You get simple installation with bottom 3/4 inch NPT connections.
Large family needing high flow rate
The VancEpic model delivers 4.8 GPM continuous hot water. It uses natural gas and produces 110,000 BTU. This higher output supports three to five outlets at once. The oxygen-free copper heat exchanger ensures fast heat transfer. You get precise temperature control within ±1°F. The unit is designed for indoor use with quiet operation features.
Homeowner wanting precise temperature stability
Both units offer ±1°F accuracy. The VancEpic uses intelligent gas and water linkage to adjust output automatically. This prevents sudden temperature fluctuations during use. You benefit from four preset temperature modes and a child lock. The brushless DC exhaust system adds safety. This setup ensures stable water temperature for sensitive skin or dishwashing needs.
The products compared
Rheem 18kW 240V Electric Tankless Water Heater
Best for: Small households needing precise temperature control
- Fuel Type
- Electric
- Flow Rate
- 4.4 GPM
- Wattage
- 18 kW
- Voltage
- 240 V
- Temperature Control
- ±1°F
- Dimensions
- 3.5 x 14.5 x 18.5 inches
View on Amazon: Rheem 18kW 240V Electric Tankless Water Heater Affiliate link
This Rheem unit delivers up to 4.4 GPM of hot water using 18 kW of power at 240 volts. It features copper immersion heating elements and an external digital thermostat with ±1°F accuracy. The compact design measures 3.5 by 14.5 by 18.5 inches and weighs 14.8 pounds. It suits small households or point-of-use applications where precise temperature control and efficient self-modulation are priorities.
Pros
- High flow rate of 4.4 GPM for electric models
- Precise digital temperature control with ±1°F accuracy
- Durable copper immersion heating elements
- Self-modulating technology adjusts power to demand
- Compact dimensions fit tight spaces
Cons
- Requires a 240V electrical circuit
- Electric operation may have higher utility costs than gas
- Limited to lower flow rates compared to gas units
Good fit if
- You need precise temperature adjustments
- You have a 240V electrical supply
- You want a compact unit for small spaces
Skip if
- You require high flow rates for whole-house use
- You only have 120V electrical outlets
- You prefer gas-powered heating efficiency
Verdict: Rheem 18kW Electric Tankless Heater offers precise control and a compact form factor for users with 240V power. It is ideal for small households or specific fixtures where exact temperature settings matter more than maximum flow volume.
VancEpic 4.8 GPM Natural Gas Tankless Heater
Best for: Indoor natural gas homes with multiple outlets
- Fuel Type
- Natural Gas
- Flow Rate
- 4.8 GPM
- BTU
- 110,000 BTU
- Installation Location
- Indoor
- Temperature Control
- ±1°F
- Dimensions
- 24.6 x 14.4 x 14.4 in
View on Amazon: VancEpic 4.8 GPM Natural Gas Tankless Heater Affiliate link
This VancEpic unit delivers 4.8 GPM at 110,000 BTU for indoor natural gas installation. It uses an oxygen-free copper heat exchanger and AirBoost combustion to support three to five outlets simultaneously. Temperature control stays within ±1°F, ensuring stable output. The compact design measures 24.6 by 14.4 by 14.4 inches. It includes preset modes and child lock safety features for family use.
Pros
- 4.8 GPM flow rate supports multiple outlets
- ±1°F precise temperature control
- Oxygen-free copper heat exchanger for durability
- AirBoost combustion technology for efficiency
- Child lock and preset modes included
Cons
- Indoor installation only
- Standard 2-year warranty
- No smart app connectivity listed
Good fit if
- You need hot water for 3-5 fixtures
- You require stable temperature within ±1°F
- You have indoor natural gas supply
Skip if
- You need outdoor installation
- You want smart app control
- You require more than 4.8 GPM
Verdict: VancEpic 4.8 GPM Natural Gas Tankless Heater suits households needing reliable hot water for multiple bathrooms. Its precise temperature control and copper heat exchanger make it a solid choice for indoor natural gas setups.
Specifications side by side
| Spec | Rheem 18kW 240V Electric Tankless Water Heater | VancEpic 4.8 GPM Natural Gas Tankless Heater |
|---|---|---|
| Fuel Type | Electric | Natural Gas |
| Flow Rate | 4.4 GPM | 4.8 GPM |
| BTU | not stated | 110,000 BTU |
| Wattage | 18 kW | not stated |
| Installation Location | not stated | Indoor |
| Voltage | 240 V | not stated |
| Temperature Control | ±1°F | ±1°F |
| Dimensions | 3.5 x 14.5 x 18.5 inches | 24.6 x 14.4 x 14.4 in |
| Use | Whole House | not stated |
| Venting Type | not stated | Non-Condensing |
| Weight | 14.8 pounds | 25.4 pounds |
| Size | Small | 4.8GPM, 110,000BTU, NG |
| Color | Gray | Non-Condensing |
| Model | RTEX-18 | VH11K-W-NG-U01 |
Frequently asked questions
Which tankless heater is better for a small household with limited space?
The Rheem 18kW Electric model is the better choice for small households. It features a compact design measuring only 3.5 by 14.5 by 18.5 inches. Weighing just 14.8 pounds, it fits easily into tight spaces. This unit is ideal if you need precise temperature control and have existing 240V electrical wiring.
Can the VancEpic heater handle multiple bathrooms running at once?
Yes, the VancEpic 4.8 GPM Natural Gas unit is designed for this. It delivers a continuous flow of 4.8 gallons per minute. This capacity supports three to five water outlets simultaneously. It is a solid choice for indoor natural gas setups where multiple family members need hot water at the same time.
What is the main difference between Rheem and VancEpic fuel types?
The primary difference is the energy source. The Rheem model runs on 240V electricity with an 18 kW output. The VancEpic unit uses natural gas and operates at 110,000 BTU. You must choose based on your home's existing infrastructure, whether that is high-voltage electrical service or a natural gas line.
Is the VancEpic heater suitable for outdoor installation?
The data specifies that the VancEpic model is for indoor installation only. It uses a non-condensing venting type, which is typical for indoor natural gas units. You should not place this unit outside. Ensure your installation location meets indoor safety and ventilation requirements for natural gas appliances.
How heavy is the Rheem electric tankless water heater?
The Rheem 18kW Electric Tankless Water Heater weighs 14.8 pounds. This light weight makes it easy to mount on a wall. Its small footprint and low mass simplify the installation process compared to heavier gas models. It is designed for straightforward mounting in areas with sufficient electrical access.
Does the VancEpic unit have a copper heat exchanger?
Yes, the VancEpic 4.8 GPM Natural Gas Heater includes a copper heat exchanger. This component helps ensure reliable performance and precise temperature control. The copper construction is beneficial for indoor natural gas setups, providing durability and efficient heat transfer for your household's hot water needs.
Which model offers more precise temperature control?
Both units offer precise temperature control within ±1°F. The Rheem model achieves this through its electric heating elements and digital interface. The VancEpic model uses its gas burner and copper heat exchanger to maintain similar precision. You can expect accurate temperature settings regardless of which brand you choose for your home.