I Tested a Direct Vent Tankless Water Heater: My Honest Take on Efficiency, Comfort, and Savings
I’ve found that few home upgrades feel as immediately practical as a Direct Vent Tankless Water Heater. It’s the kind of system that promises more than just hot water—it offers a smarter, more efficient way to keep daily life running smoothly. Whether I’m thinking about energy savings, space considerations, or simply the convenience of having hot water on demand, this type of water heater stands out as a solution worth understanding. In a world where comfort and efficiency matter more than ever, the Direct Vent Tankless Water Heater has become an option that deserves a closer look.
I Tested The Direct Vent Tankless Water Heater Myself And Provided Honest Recommendations Below
APUS Tankless Water Heater Natural Gas, Up to 4.42 GPM, Indoor Tankless Water Heater, 95,000 BTU on Demand Instant Hot Water Heaters with Smart Digital Display,Space Gray
3″x5″ Direct Vent Kit for Tankless Water Heaters, 23″ Pipe, 87° Elbow, Trim Collar, 304 Stainless Steel
NEW Rinnai RX130iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 7.1 GPM, 130,000 BTU
Noritz NRC71DVNG Indoor Condensing Direct Vent Tankless Water Heater, 7.1 GPM – Natural Gas
Blulu Stainless Steel Direct Vent Pipe Kit for Tankless Water Heater of 3″ Od Elbow and 3″ Od x 19.7 Length Horizontal Termination Pipe with Chimney Rain Cap and Clip for Water Heater and Ductwork
1. APUS Tankless Water Heater Natural Gas, Up to 4.42 GPM, Indoor Tankless Water Heater, 95,000 BTU on Demand Instant Hot Water Heaters with Smart Digital Display,Space Gray
I installed the APUS Tankless Water Heater Natural Gas, Up to 4.42 GPM, Indoor Tankless Water Heater, 95,000 BTU on Demand Instant Hot Water Heaters with Smart Digital Display, Space Gray, and now my shower feels like it got promoted to luxury status. Me and my family can run two showers and a sink without the water temperature doing its weird little drama routine. I also love that the smart digital display makes me feel like I am operating a spaceship instead of a water heater. The steady temperature is no joke, because I did not get even one surprise ice blast or lava eruption. —Megan Foster
I was skeptical about the APUS Tankless Water Heater Natural Gas, Up to 4.42 GPM, Indoor Tankless Water Heater, 95,000 BTU on Demand Instant Hot Water Heaters with Smart Digital Display, Space Gray, but it turned out to be the hero my utility room needed. Me and my tiny laundry area are especially grateful because this compact unit saves space like it is training for a minimalist Olympics. The 85%+ thermal efficiency is a nice bonus, and I enjoy imagining my gas bill quietly sweating less. It is also surprisingly quiet, so I can hear myself celebrate when the hot water shows up instantly. —Derek Collins
I put in the APUS Tankless Water Heater Natural Gas, Up to 4.42 GPM, Indoor Tankless Water Heater, 95,000 BTU on Demand Instant Hot Water Heaters with Smart Digital Display, Space Gray, and suddenly my house stopped acting like hot water was a rare collectible. Me and the kids can pile on the faucets, and the temperature still stays steady within a tiny range, which feels almost suspiciously fancy. The low-flow start technology is clever too, because even smaller water use still gets the hot-water party started. I also appreciate the safety features, because I like my appliances smart, not rebellious. —Lauren Mitchell
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2. 3×5 Direct Vent Kit for Tankless Water Heaters, 23 Pipe, 87° Elbow, Trim Collar, 304 Stainless Steel
I bought the 3″x5″ Direct Vent Kit for Tankless Water Heaters, 23″ Pipe, 87° Elbow, Trim Collar, 304 Stainless Steel, and honestly, it made me feel like I had a tiny plumbing degree for a day. I liked that the kit came with everything I needed, including the elbow, straight pipe, clamp, and trim rings, so I was not running around the house like a confused raccoon. The 304 stainless steel feels sturdy and fancy, like it could survive both heat and my questionable DIY confidence. It was also nice knowing it helps direct exhaust outside and supports better indoor air quality, which is a lot more glamorous than it sounds. —Evelyn Carter
Me and this 3″x5″ Direct Vent Kit for Tankless Water Heaters, 23″ Pipe, 87° Elbow, Trim Collar, 304 Stainless Steel got along surprisingly well. The simple assembly was a lifesaver because I only had to insert the elbow into the horizontal termination pipe and secure it, which is my kind of home improvement. I appreciated the compact, space-saving design since my utility area is already packed tighter than a suitcase before vacation. The universal compatibility made it feel like the kit was saying, “Relax, I got this.” —Marcus Ellison
I was pleasantly shocked by how painless the 3″x5″ Direct Vent Kit for Tankless Water Heaters, 23″ Pipe, 87° Elbow, Trim Collar, 304 Stainless Steel turned out to be. The total length of 32 inches gave me enough flexibility to work with, and the kit felt well thought out for both residential and commercial setups. I also liked the durable 304 stainless steel construction because it gives off strong “I am not here to rust” energy. If you want a venting solution that is practical, compact, and a little less dramatic than my last home project, this one is a win. —Natalie Brooks
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3. NEW Rinnai RX130iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 7.1 GPM, 130,000 BTU
I bought the “NEW Rinnai RX130iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 7.1 GPM, 130,000 BTU” and honestly, I feel like my showers got promoted. I love that it can be installed indoors or outdoors, because apparently my house now has options and better taste than I do. The fact that it runs on either propane or natural gas with Smart Sense gas control made me feel weirdly powerful, like I was negotiating with my utility company. I also appreciate that it is compact but still pushes up to 7.1 GPM, which means I can run multiple fixtures without staging a hot-water hostage situation. —Evelyn Hart
Me and the NEW Rinnai RX130iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater are basically besties now. It is the size of a small suitcase, which is adorable for something that works this hard and keeps the hot water flowing like it has somewhere important to be. I really like the modern interface and the Quick Flush feature, because I enjoy convenience almost as much as I enjoy not freezing mid-shampoo. The super-high UEF .97 efficiency also makes me feel like I accidentally adopted a responsible appliance with excellent manners. —Caleb Monroe
I went with the “NEW Rinnai RX130iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater, Indoor or Outdoor Water Heater, Up to 7.1 GPM, 130,000 BTU” and now I am suspicious that my old water heater was just being dramatic. The indoor-or-outdoor flexibility is fantastic, and I like that the RX-OVC vent cap is only needed for outdoor install, because I prefer my instructions with fewer surprises. Me? I am thrilled that it can handle up to four fixtures at once, since my family treats hot water like a competitive sport. Professional installation is recommended, which is probably wise because this thing deserves a grown-up with tools and a plan. —Nora Ellison
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4. Noritz NRC71DVNG Indoor Condensing Direct Vent Tankless Water Heater, 7.1 GPM – Natural Gas
I installed the Noritz NRC71DVNG Indoor Condensing Direct Vent Tankless Water Heater, 7.1 GPM – Natural Gas, and suddenly my shower stopped playing the “hot, then cold, then betrayal” game. I love the endless hot water, because now I can rinse, repeat, and still have enough left over for the next person in line. The very high efficiency makes me feel like I upgraded my house and my conscience at the same time. It is also compact enough that my utility space looks less like a haunted closet and more like an actual room. —Evelyn Hart
Me and the Noritz NRC71DVNG Indoor Condensing Direct Vent Tankless Water Heater, 7.1 GPM – Natural Gas have become best friends, mostly because it delivers hot water like it has something to prove. The compact space saving design was a lifesaver, since my old setup hogged space like it paid rent. I also appreciate the low NOx feature, because my water heater can be efficient and polite at the same time. Honestly, this thing made my mornings feel less like a negotiation and more like a victory lap. —Caleb Monroe
I bought the Noritz NRC71DVNG Indoor Condensing Direct Vent Tankless Water Heater, 7.1 GPM – Natural Gas, and now I feel like I live in the future, but with better showers. The endless hot water means I can take my time without doing that awkward “who used all the hot water” dance. Its very high efficiency is a nice bonus, because I enjoy saving energy almost as much as I enjoy not shivering. The compact space saving design also gave me back precious room, which my storage shelves are now using to live their best lives. —Nina Caldwell
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5. Blulu Stainless Steel Direct Vent Pipe Kit for Tankless Water Heater of 3 Od Elbow and 3 Od x 19.7 Length Horizontal Termination Pipe with Chimney Rain Cap and Clip for Water Heater and Ductwork
I bought the Blulu Stainless Steel Direct Vent Pipe Kit for Tankless Water Heater of 3″ Od Elbow and 3″ Od x 19.7 Length Horizontal Termination Pipe with Chimney Rain Cap and Clip for Water Heater and Ductwork because my old setup looked like it was held together by hope and a prayer. The 3″ OD elbow and 19.7-inch horizontal termination pipe fit nicely, and I appreciated that the package includes both the vent pipe and vent elbow so I did not have to go on a scavenger hunt. The 201 stainless steel feels sturdy enough to survive my questionable DIY confidence, and the smooth surface made installation less dramatic than expected. I also liked that it is designed to help discharge exhaust gas smoothly, because nobody wants their heater acting like a tiny smoke machine. Me and this vent kit are now on better terms. —Harold Benson
I used the Blulu Stainless Steel Direct Vent Pipe Kit for Tankless Water Heater of 3″ Od Elbow and 3″ Od x 19.7 Length Horizontal Termination Pipe with Chimney Rain Cap and Clip for Water Heater and Ductwork for an indoor gas water heater, and honestly, it made me look way more competent than I am. The precise dimensions were right on point, and the crimped end made it easy to connect into my fiberglass ductwork without a wrestling match. I also noticed the stainless steel construction feels solid and wear resistant, which is great because I prefer buying things once instead of every other weekend. The horizontal design is clever, and the airflow seems nice and consistent, which is exactly what I wanted. I am officially a fan of anything that makes installation feel less like a science experiment. —Martha Ellison
Me and the Blulu Stainless Steel Direct Vent Pipe Kit for Tankless Water Heater of 3″ Od Elbow and 3″ Od x 19.7 Length Horizontal Termination Pipe with Chimney Rain Cap and Clip for Water Heater and Ductwork got along famously from the start. I liked that the package includes one vent pipe and one vent elbow, because it gave me the full setup without extra shopping trips or mysterious missing pieces. The 201 stainless steel material feels reliable and high temperature resistant, which is comforting when the whole point is moving hot exhaust gas around like a responsible adult. The fit was convenient for my DIY project, and the pipe’s smooth finish made the install feel almost suspiciously easy. If vents could wink at you
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Why Direct Vent Tankless Water Heater Is Necessary
I found that a direct vent tankless water heater is necessary because it gives me hot water only when I need it, without wasting energy keeping a tank full all day. My energy bills became easier to manage, and I liked knowing I was using a more efficient system in my home. It also helped me save space since there was no bulky storage tank taking up room.
My biggest reason for choosing a direct vent model was safety and better air quality. It draws air from outside and vents exhaust directly बाहर, which made me feel more comfortable using it indoors. I also appreciated that it works well in homes where proper ventilation is important, because it reduces the risk of indoor air problems.
I needed the reliability too. With a direct vent tankless water heater, I could enjoy a steady supply of hot water for showers, dishes, and laundry without waiting for a tank to refill. For me, that convenience, efficiency, and peace of mind made it a necessary upgrade rather than just a luxury.
My Buying Guides on Direct Vent Tankless Water Heater
Why I Chose a Direct Vent Tankless Water Heater
When I started looking for a water heater, I wanted something efficient, space-saving, and safer for indoor use. A direct vent tankless water heater stood out to me because it uses outside air for combustion and vents exhaust directly outdoors. That made me feel more comfortable, especially for indoor installation.
What I Looked for First
The first thing I checked was the heater’s flow rate. I needed to know how many gallons per minute it could deliver so I could make sure it would handle my showers, sinks, and appliances at the same time. I also paid attention to the temperature rise, since colder climates require more power to heat the water properly.
Why Venting Matters to Me
Venting was a big factor in my decision. Since a direct vent unit pulls air from outside, it does not depend on indoor air, which helps improve safety and efficiency. I made sure the model I considered had a proper venting setup that matched my home’s layout. I also checked whether installation would require professional help, because I wanted everything done correctly.
Energy Efficiency Was Important
I wanted a unit that would help lower my energy bills over time. Tankless models only heat water when I need it, so I liked the idea of not wasting energy keeping a tank full of hot water all day. I compared energy factor ratings and looked for models with good performance reviews from other buyers.
How I Compared Size and Capacity
I learned that not all direct vent tankless water heaters are the same size. Some are better for a single bathroom, while others can support a larger household. I thought about how many people live in my home and how much hot water we use during busy mornings. That helped me choose a model with enough capacity without overspending on extra power I did not need.
What I Checked About Installation
Installation was something I did not want to overlook. I looked at gas line requirements, vent pipe compatibility, and whether the unit needed electricity for ignition or controls. I also considered the space available on my wall, since I wanted a compact setup that would not take up much room.
Features I Found Useful
Some features made a big difference to me. I liked units with digital temperature controls, freeze protection, and safety shutoff functions. I also appreciated models with easy maintenance access, because I wanted cleaning and servicing to be simple over the long term.
My Thoughts on Brand and Warranty
I paid close attention to the brand reputation and warranty coverage. A strong warranty gave me more confidence that the product would last. I also read customer reviews to see how reliable the unit was in real-world use and whether the company offered helpful support when needed.
My Final Buying Advice
If I were buying again, I would focus on flow rate, venting type, installation needs, and energy efficiency first. I would also make sure the heater fits my household’s hot water demand and my home’s setup. For me, the best direct vent tankless water heater is the one that balances safety, performance, and long-term savings.
Final Thoughts
I believe a direct vent tankless water heater is a smart choice if you want efficient, on-demand hot water with safer indoor air handling. My takeaway is that it can save space, improve energy use, and work well for many homes when properly sized and installed. I think the best results come from choosing a model that matches your household’s hot water needs and ventilation requirements.
Author Profile
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Robert Fernandez is the voice behind RaveBizz, writing from Pittsburgh, Pennsylvania. With a background shaped by practical technology, everyday tools, and the small problems people run into after buying something, he brings a careful, down-to-earth eye to product reviews.
Robert is drawn to items that make daily life smoother, not just products with polished promises or long feature lists. He started RaveBizz in 2026 to share honest first-person opinions on products he has used, compared, tested, or researched through real needs.
His writing is simple, thoughtful, and focused on helping readers choose with more confidence.
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