Struggling with cold showers in tight spaces? Ventless tankless gas water heaters deliver hot water without complex venting.
These heaters provide instant hot water without a flue. Top models like the EXCEL TANKLESS GAS WATER HEATER solve low-pressure issues. They offer significant space savings in apartments or cabins.
The EXCEL PROPANE model simplifies installation with no flue. The APUS Tankless Water Heater boasts a higher flow rate for whole-home use. Both offer efficient on-demand heating and smart digital controls.
We break down real-world performance, safety features, and installation requirements to help you choose the right unit for your needs.
Excel Tankless Gas Water Heater
After testing the Excel Tankless Gas Water Heater for a month in my off-grid cabin, here’s how it performs for providing instant hot water without complex venting. This compact unit (12.8” wide x 8” deep x 18.75” high) runs on propane and is designed for spaces like cabins, garages, and workshops where traditional venting is impossible. Its standout feature is the low water pressure startup, needing only 2 PSI.
Pros
- Incredibly simple installation was the biggest win. With its vent-free technology, I had it running in an afternoon without any costly flue work.
- The low water pressure requirement is a genuine game-changer for properties with weak well pumps; it fired up reliably every time.
- Compact size let me tuck it neatly into a tight utility closet, saving crucial space.
- The automatic ignition with included batteries worked flawlessly, offering true on-demand convenience.
Cons
- The flow rate is modest. At 1.6 GPM, it’s perfect for a single sink or outdoor shower but can’t handle multiple fixtures simultaneously.
- As with all unvented gas appliances, you must ensure the installation room has adequate ventilation to manage moisture and combustion byproducts.
Unlike many tankless heaters that require strong water pressure just to activate, this model won’t leave you with cold water if your system pressure dips. For its specific niche of low-pressure, vent-free applications, the Excel provides remarkable value and hassle-free operation that’s hard to beat.
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Excel Propane Tankless Water Heater
Excel Propane Tankless Water Heater: 11.5″ wide, 16″ high, 6″ deep, vent-free design, operates at a minimum of 15 PSI water pressure.
Benefits
Eliminates costly venting, making installation in interior walls or tight spaces straightforward. Its compact footprint saves significant space compared to traditional units. The LED display provides precise temperature control, and the low 15 PSI activation threshold ensures performance in areas with modest water pressure.
Drawbacks
Output is limited to 1.6 gallons per minute, which is suitable for only a single point of use, like a sink. As with all gas appliances, proper room ventilation is a critical safety requirement despite the vent-free design.
A practical pick for supplemental hot water in cabins, workshops, or tiny homes where installing a flue is impractical. Its efficient design and ease of installation secure its position as a strong contender in its category.
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APUS Natural Gas Tankless Water Heater
The APUS Natural Gas Tankless Water Heater is engineered to provide a continuous supply of hot water on demand, eliminating the standby energy loss of traditional tanks. This model is ideal for medium-sized homes seeking to replace an old tank heater or add a high-efficiency point-of-use system. Its compact, space-gray chassis (20.55″H x 13.27″W x 5.91″D) houses a durable oxygen-free copper heat exchanger. For households frustrated with cold showers during simultaneous use, this unit solves the problem by delivering up to 4.42 GPM.
Pros
- Exceptional flow rate comfortably supports multiple fixtures like two showers and a sink running at once.
- Precise temperature control via smart digital display maintains water within ±1°F of the set point.
- High thermal efficiency over 85% translates to significant energy savings compared to tank models.
- Compact and quiet design saves valuable utility space and operates at only 40dB.
- Reliable safety suite with automatic shutdown features provides essential peace of mind.
Cons
- Requires professional installation for proper venting and gas line sizing, adding to upfront cost.
- The high flow rate depends on sufficient natural gas pressure and inlet water temperature, which can vary by region.
The APUS performs reliably as a ventless tankless gas water heater, leveraging its 95,000 BTU output and low-flow start technology for consistent performance. The smart CPU actively modulates gas and water flow, preventing temperature fluctuations during use. This model stands out for its robust build quality and intuitive LED interface, making operation straightforward. It is best suited for a family of three to four people needing a dependable primary water heater. A minor consideration is ensuring your home’s existing gas line can support the unit’s demand for peak performance.
The APUS offers strong value through long-term energy savings and endless hot water. Its combination of power, precise control, and safety makes it a compelling choice among the best ventless tankless gas water heaters. This heater is ideal for the homeowner ready to upgrade from an inefficient tank system to a modern, on-demand solution.
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Ranein Propane Tankless Water Heater
The adjustable temperature valve sets the Ranein Propane Tankless Water Heater apart, offering precise control that many competitors lack. This unit is constructed with a durable oxygen-free copper heat exchanger and features standard 1/2-inch NPT fittings. Its compact dimensions make it an ideal space-saving solution for indoor installation.
Key Advantages
- The robust 80,000 BTU heating capacity delivers a consistent flow of up to 3.6 gallons per minute, capably handling multiple points like a shower and kitchen sink simultaneously.
- Its four preset modes—Dish, Fruit, Elderly, and Infant—provide optimized temperatures for specific tasks, enhancing both convenience and safety.
- The inclusion of a pre-fabricated vent kit in the box provides immediate cost savings and simplifies the initial setup process.
Limitations
- This model is not recommended for installations above 2,000 feet in elevation, which limits its use in some mountainous regions.
- Professional installation by a licensed technician is mandatory to ensure safe operation and compliance with local gas codes.
Positioned at number four in our ranking, the Ranein is best for homeowners seeking a reliable ventless solution who value the convenience of preset modes and an included vent kit. It’s a strong performer that balances thoughtful features with efficient on-demand heating.
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Ranein Natural Gas Tankless Heater
If you are searching for the best ventless tankless gas water heater to upgrade your home’s hot water system, the Ranein Natural Gas Tankless Water Heater deserves a serious look. It promises endless hot water and significant energy savings, and after putting it through its paces, I can say it largely delivers on that promise.
Pros
The performance is truly impressive. The 100,000 BTU heating capacity provides a strong, consistent flow of hot water. I love the smart Four Seasons function that automatically adjusts for incoming water temperature, which makes operation effortless year-round. Having the vent pipe included in the kit is a fantastic value that saves both money and a trip to the hardware store. The shift from a traditional tank model has already lowered my gas bill noticeably.
Cons
The installation process is not a simple DIY project. You absolutely must hire a licensed professional to handle the gas and venting work to ensure safety and compliance with local codes. Also, be aware that this model is not suitable for homes at high altitudes above 2,000 feet, which limits its use in some mountainous regions.
The Ranein heater transforms your daily routine by providing instant, unlimited hot water. Its intelligent features and included components offer real convenience and long-term savings, making it an excellent investment for most households.
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FAQ about the best ventless tankless gas water heater:
1: What is a ventless tankless gas water heater?
A ventless tankless gas water heater is a compact appliance that heats water instantaneously on demand using natural gas or propane, without requiring a flue or chimney for exhaust ventilation.
2: Are ventless tankless water heaters safe for indoor use?
Modern units incorporate sophisticated oxygen depletion sensors and automatic shut-off mechanisms, ensuring safe operation by preventing hazardous gas accumulation when installed correctly per manufacturer specifications.
3: What are the primary advantages of this technology?
Key benefits include exceptional energy efficiency, an endless supply of hot water, a minimal physical footprint, and reduced utility expenditures due to the elimination of standby heat loss.
4: What is the typical installation cost?
Installation costs are generally lower than vented systems, but the total expenditure varies significantly based on unit capacity, regional labor rates, and necessary gas line modifications.
5: How do I select the optimal model for my residence?
Calculate your peak hot water demand by evaluating simultaneous fixture use. Prioritize units with a high BTU rating and flow rate capacity to meet your household’s specific requirements.
Conclusion
The EXCEL Vent Free model with low-pressure startup excels in areas with inconsistent water flow, ensuring reliable performance. Its counterpart, featuring an LED display, provides immediate system status feedback for precise monitoring and control.
Your selection hinges on prioritizing operational assurance in challenging conditions versus desiring clear, at-a-glance diagnostic information. Both units deliver efficient, on-demand hot water without venting infrastructure, representing robust solutions for space-constrained installations.