Condensing or Non-Condensing Tankless Water Heaters? Compared by Specs
As an Amazon Associate we earn from qualifying purchases. Links on this page are affiliate links.
When comparing condensing vs non condensing tankless water heater options, you face a choice between high-capacity efficiency and compact simplicity. Both units provide on-demand hot water using natural gas. The Rinnai RX199iN uses a condensing design for higher efficiency and dual-fuel flexibility. The VancEpic VH11K uses a non-condensing design with a smaller footprint. This guide breaks down the key spec differences to help you decide.
Key differences
| Aspect | Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater | VancEpic 4.8 GPM Natural Gas Tankless Heater |
|---|---|---|
| Venting Type | Condensing | Non-Condensing |
| Flow Rate | 11.1 GPM | 4.8 GPM |
| Fuel Type | Propane or Natural Gas | Natural Gas |
| Installation Location | Indoor/Outdoor | Indoor |
| UEF | .98 | not listed |
Which one should you choose?
Choose Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater if
- You need hot water for multiple fixtures running simultaneously.
- You want the flexibility to use propane or natural gas.
- You plan to install the unit outdoors or in varied climates.
Choose VancEpic 4.8 GPM Natural Gas Tankless Heater if
- You have limited space for a smaller unit.
- You only need hot water for a few points of use.
- You prefer a simpler indoor-only installation setup.
Verdict: Choose the Rinnai RX199iN if you require high flow rates and dual-fuel versatility for a whole house. Pick the VancEpic VH11K if you need a compact, indoor-only solution for lower demand. The condensing model offers superior efficiency, while the non-condensing unit provides a smaller physical footprint.
Condensing vs Non-Condensing Specs
venting type
The Rinnai RX199iN uses a condensing venting system. This design captures heat from exhaust gases to improve overall efficiency. The VancEpic VH11K-W-NG-U01 is a non-condensing unit. It relies on standard combustion venting. Condensing models often offer higher energy efficiency factors. Non-condensing units are typically simpler to install in existing setups. You must choose based on your home's venting infrastructure and efficiency goals. The Rinnai model supports both indoor and outdoor installation with specific venting kits. The VancEpic unit is designed for indoor use only.
flow rate
Capacity is a major differentiator here. The Rinnai RX199iN delivers 11.1 gallons per minute. This high flow rate supports up to seven fixtures running simultaneously. The VancEpic VH11K-W-NG-U01 provides 4.8 gallons per minute. This capacity is suitable for three to five water outlets. If you have a large household or need to run multiple showers, the Rinnai unit offers significantly more water volume. The VancEpic model is better suited for smaller homes or point-of-use applications where lower flow is acceptable.
fuel type
Fuel flexibility varies between these two units. The Rinnai RX199iN is a dual-fuel heater. It can run on either propane or natural gas using a Smart Sense gas control system. This allows you to switch fuels if your home's supply changes. The VancEpic VH11K-W-NG-U01 is specified for natural gas only. While it offers high BTU output for its size, it lacks the fuel versatility of the Rinnai. If you use propane or might switch fuel sources, the Rinnai is the more adaptable choice.
installation location
Where you place the heater matters for convenience and safety. The Rinnai RX199iN is rated for both indoor and outdoor installation. You can place it in a garage, basement, or exterior wall with the proper vent cap. The VancEpic VH11K-W-NG-U01 is listed for indoor installation only. Its design and safety features are optimized for interior spaces. If you need an outdoor solution or have limited indoor space, the Rinnai provides more placement options. The VancEpic is strictly for indoor use.
size
Physical dimensions affect where you can fit the unit. The VancEpic VH11K-W-NG-U01 is compact, measuring 24.6 inches high, 14.4 inches wide, and 14.4 inches deep. It weighs 25.4 pounds. The Rinnai RX199iN is larger, measuring 30.1 inches high, 18.5 inches wide, and 30.1 inches deep. It weighs 55 pounds. The VancEpic unit is significantly smaller and lighter, making it easier to install in tight spaces. The Rinnai requires more room due to its higher capacity and condensing components.
Choose the Right Unit for Your Needs
Large home needing high flow and efficiency
The Rinnai RX199iN delivers 11.1 GPM, supporting up to seven fixtures simultaneously. Its condensing design achieves a UEF of .98, maximizing energy savings. You can install it indoors or outdoors, and it runs on propane or natural gas. This model suits households requiring substantial hot water volume with superior thermal efficiency.
Small household prioritizing compact size and precision
The VancEpic unit measures just 24.6 inches tall and weighs 25.4 pounds. It offers precise temperature control within ±1°F for consistent comfort. With 4.8 GPM, it supports three to five outlets. The non-condensing design and oxygen-free copper heat exchanger provide reliable performance for smaller homes or specific fixture groups.
User wanting dual-fuel versatility and smart features
This Rinnai model features Smart Sense gas control, allowing operation on either propane or natural gas. The condensing venting system enhances efficiency while the compact footprint fits various spaces. You get a Quick Flush feature for maintenance and compatibility with the Controlr module for WiFi connectivity, offering modern convenience.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater | High-flow needs with flexible venting | Check price of Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater on Amazon |
| 2 | VancEpic 4.8 GPM Natural Gas Tankless Heater | Whole-house hot water with non-condensing venting | Check price of VancEpic 4.8 GPM Natural Gas Tankless Heater on Amazon |
The products compared
Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater
Best for: High-flow needs with flexible venting
- Venting Type
- Condensing (what this guide is about)
- Fuel Type
- Natural Gas or Propane
- Flow Rate
- 11.1 GPM
- BTU
- 199k BTU
- Installation Location
- Indoor/Outdoor
- Dimensions
- 30.1 × 18.5 × 30.1 inches
View on Amazon: Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater Affiliate link
The Rinnai RX199iN is a condensing tankless water heater that delivers 11.1 GPM of hot water. It runs on propane or natural gas and fits indoor or outdoor spaces. The unit measures 30.1 by 18.5 by 30.1 inches and weighs 55 pounds. Its high energy factor of .98 reduces operating costs. You get a compact design that supports multiple fixtures simultaneously.
Pros
- 11.1 GPM flow rate supports up to seven fixtures
- Versa Vent system allows indoor or outdoor installation
- Smart Sense gas control works with propane or natural gas
- UEF of .98 indicates high energy efficiency
Cons
- WiFi Controlr module is not included
- Labor warranty drops to one year if not registered within 90 days
- Requires professional installation and specific outdoor vent cap
Good fit if
- You need high flow for multiple bathrooms
- You want a condensing unit for efficiency
- You need flexible indoor or outdoor placement
Skip if
- You prefer non-condensing technology
- You want built-in WiFi without extra purchase
- You plan to install it yourself without a pro
Verdict: Rinnai RX199iN 11.1 GPM Condensing Heater delivers high output and efficiency for homes needing hot water at multiple points. It suits buyers who value flexible venting and high performance over plug-and-play simplicity.
VancEpic 4.8 GPM Natural Gas Tankless Heater
Best for: Whole-house hot water with non-condensing venting
- Venting Type
- Non-Condensing (what this guide is about)
- Fuel Type
- Natural Gas
- Flow Rate
- 4.8 GPM
- BTU
- 110,000 BTU
- Installation Location
- Indoor
- Temperature Control
- ±1°F
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 non-condensing venting and features an oxygen-free copper heat exchanger. The system maintains temperature within ±1°F and includes four preset modes with child lock. It supports 3-5 outlets and offers a 2-year warranty. This model suits households needing reliable whole-house hot water without condensing complexity.
Pros
- 4.8 GPM flow rate for 3-5 outlets
- ±1°F precise temperature control
- Oxygen-free copper heat exchanger
- 4 preset temperature modes
- 2-year warranty coverage
Cons
- Non-condensing design requires standard venting
- Indoor installation only
- Shorter 2-year warranty period
Good fit if
- You need 4.8 GPM for whole-house use
- You prefer non-condensing venting simplicity
- You want precise temperature stability
Skip if
- You require condensing efficiency
- You need outdoor installation
- You want a longer warranty
Verdict: VancEpic 4.8 GPM Natural Gas Heater provides stable hot water for families needing high flow rates with non-condensing venting. It fits homes prioritizing consistent temperature control and straightforward indoor installation over maximum energy efficiency.
Specifications side by side
| Spec | Rinnai 11.1 GPM Condensing Dual-Fuel Water Heater | VancEpic 4.8 GPM Natural Gas Tankless Heater |
|---|---|---|
| Fuel Type | Natural Gas or Propane | Natural Gas |
| Flow Rate | 11.1 GPM | 4.8 GPM |
| BTU | 199k BTU | 110,000 BTU |
| Installation Location | Indoor/Outdoor | Indoor |
| Temperature Control | not stated | ±1°F |
| Dimensions | not stated | 24.6 x 14.4 x 14.4 in |
| Venting Type | Condensing | Non-Condensing |
| Weight | 55 pounds | 25.4 pounds |
| Size | 11.1 GPM | 4.8GPM, 110,000BTU, NG |
| Color | Silver | Non-Condensing |
| Model | RX199iN | VH11K-W-NG-U01 |
Frequently asked questions
Is a condensing tankless water heater worth the extra cost?
Yes, if you prioritize energy savings and high flow rates. The Rinnai RX199iN uses condensing technology to capture exhaust heat, achieving a UEF of .98. This design maximizes efficiency for homes needing hot water at multiple points simultaneously, supporting up to seven fixtures.
Can I install a condensing unit indoors?
Yes, you can install the Rinnai RX199iN indoors or outdoors. Its condensing venting system allows for flexible placement options. This makes it suitable for various home layouts where standard venting might be difficult, provided you have the necessary clearance and gas connection.
What is the main difference between condensing and non-condensing venting?
Condensing units capture heat from exhaust gases to improve efficiency, while non-condensing units use standard combustion venting. The VancEpic VH11K-W-NG-U01 relies on non-condensing venting, which is simpler but generally less efficient than the condensing design found in models like the Rinnai RX199iN.
Which unit is better for a large family?
The Rinnai RX199iN is better for large families due to its 11.1 GPM output. It supports up to seven fixtures simultaneously. The VancEpic unit offers 4.8 GPM, which is adequate for smaller households but may struggle with simultaneous high-demand usage in larger homes.
Do I need dual-fuel capability for a condenser heater?
No, dual-fuel capability is not required but offers flexibility. The Rinnai RX199iN supports dual-fuel operation, allowing you to switch between gas types if needed. This feature adds versatility for buyers who value flexible venting and high performance over simple, single-fuel operation.
How big is a non-condensing tankless water heater?
The VancEpic VH11K-W-NG-U01 measures 14.4 inches in width and 24.6 inches in height. It weighs 25.4 pounds. This compact size makes it suitable for straightforward indoor installation where space is limited, offering consistent temperature control without the bulk of larger condensing units.