$618. Precisely engineered accessories can add even more reliability, convenience and flexibility to Rinnai Tankless Water Heaters. We have had this Rinnai water heater for a year now so its time for a review. 0 mobile app features timers, programmable schedules and. Add To Cart. REP160eN. The Rinnai difference . 5 GPM Residential Natural Gas Interior Tankless Water Heater with 21 in. 00 (304). In fact, Rinnai Tankless Water Heaters use up to 40% less energy than a traditional tank water heater. 26 – 11. 2(b)4 of the 2022 Building Energy Efficiency Standards. +. Dover, Ohio 44622. Manufacturer. com. Free Delivery. 80W. Plus, diagnostic tools and remote monitoring from local Rinnai experts provide rapid service and peace of mind. Shop Rinnai, Tankless Water Heaters. 08 (10%) ( 9) Model# RE199iP. Precisely engineered accessories can add even more reliability, convenience and flexibility to Rinnai Tankless Water Heaters. 69 ( 15 %) $84. • Enjoy Endless Hot Water. Built to commercial-grade standards, Rinnai tankless water heaters are individually tested, backed by the industry's best warranty, and compact enough to fit any space. — WHAT TO DO IF YOU SMELL GAS • Do not try to light any appliance. RSC Model Series. At approximately 6:15 am on a crisp Tuesday morning, Rinnai America Corporation made history in the United States, and all of North America. The old style was used until 2009, and the new style is used today. 38 $3,358. The Rinnai Hydronic Air Handler System easily integrates with select tankless water heaters or boilers to deliver energy-efficient warmth. We just installed a Navien NPE 180-A tankless water heater. Rinnai V53DeN Natural Gas Tankless Hot Water Heater, 5. S. Features : Thermal Efficiency is 95%. Plus, with premium technology, increased energy efficiency, an improved Home Energy Rating System (HERS) Index Score and. Compare. 78. 1 selling brand of tankless gas water heaters in North America, announces it has manufactured its first unit in the United States, just eight months after it announced plans to start manufacturing domestically. Rinnai tankless water heaters are available with natural gas or propane fuel options and can be installed inside or outside. Rinnai's super high-efficiency plus condensing outdoor tankless water heater models offer the most advanced technology. us 5 Optimized Concentric Venting for Non-Condensing Models Rinnai Tankless Water Heaters were the first to use a unique concentric venting system – featuring an inner pipe for exhaust and an outer pipe forThe Rheem ECO160DVLP3-1 Indoor Liquid Propane Tankless Water Heater can provide up to 7. New at Rinnai. Enjoy Endless Benefits With Rinnai Tankless Water Heaters. Rinnai offers a 12-year warranty on their tankless water heaters, while Rheem offers a 10-year warranty. More Options Available. With technology that operates only when hot water is needed, super-efficient heating coils, no pilot light and no storage tank to heat and reheat water, you save on energy and utility costs. Take control of your tankless technology with the new Noritz wireless adapter. 2 Compliant). Compare. KM Series Manual 3 CAUTION URN HAZARD. Hot water ready Hot water use Morning Showers Laundry Dishes Baths Day 1 Days 2-7 Learn more at rinnai. Super High Efficiency Plus 11 GPM Indoor Residential 199,000 BTU Natural Gas Tankless Water Heater with Termination Kit (6). 3 bar. My point is that Rinnai doesn’t have hot water heaters and Rheem has a lot of them. Rinnai produces over 12 million appliances every year, which are distributed globally, and are all ISO 9001 and ISO 1400I certified (International standard for environmental management systems). Maximum Performance That Lasts Longer. Wi-Fi Control Module for Rinnai Tankless Water Heaters. Free Shipping! Please select a finish. Rinnai RU199iN Tankless Water Heater. Silver. Plus, with premium technology, increased energy efficiency, an improved Home Energy Rating System (HERS) Index Score and optimized LEED eligibility, our tankless solutions can increase your home's value. This guide applies to storage gas water heaters, instantaneous or tankless gas water heaters, electric resistance water heaters, and electric heat pump water heaters. Available consumer financing and rebates may add further savings. M. Lift, Position and Secure the Rack Installation. Rinnai products provide peace of mind with warranties that surpass the. Noritz manufactures units for hot water production and radiant heating applications while Rinnai doesn't. This item: Rheem 18kW 240V Tankless Electric Water Heater. Purchase and install a rocker switch or “doorbell” style buttons to activate the NRCR “on-demand” mode to prime the pump for use only when you want it. Book an Appointment. Get customizable control and convenience for your Rinnai tankless water heater with Control-r™. +. on demand hot water heater. Gas or liquid propane tankless water heaters can be installed either vertically or horizontally. Keep away from the water heater. Now, with Smart-Circ, Rinnai RSC model water heaters learn your water usage patterns to start circulating hot water on your schedule, anticipating your hot water needs for a shorter wait and saving energy during times when you don't. Imagine never running out of hot water even when your dishwasher is running, someone is doing laundry and you have multiple showers running at the same time. Electrical consumption. • Install the vent system per local and na-tional codes. 5. Rheem 13kw Tankless Electric Water Heater RTEX-13. Plus, with premium technology, increased energy efficiency, an improved Home Energy Rating. Ideal for small to medium homes or remodels. Hot exhaust and vent may cause serious burns. After checking for leaks, turn the gas line. The date of manufacture is. Engineered expressly for the North American residential market, the EZ Series of high-efficiency, condensing tankless water heaters from Noritz America are designed to cut installation time and cost when replacing larger, storage tank-type units. Navien offers a 15-year warranty on the heat exchanger and a 5-year warranty on parts. You can even qualify for energy. Only the size of a small suitcase, the natural gas RU180eN model is compact, easy-to-install and perfect for outdoor locations. The Rinnai RH180 Hybrid Tank-Tankless Water Heater is a unique combination blending the benefits of advanced technology and simple supply; it pairs an. 0 GPM Sensei+ with Smart-Circ Condensing Tankless Hot Water Heater with Built-In Recirculation for Outdoor Installation. With technology that operates only when hot water is needed, super-efficient heating coils, no pilot light and no storage tank to heat and reheat water, you save on energy and utility costs. EneryStar Rated Performance: Rinnai has 23 EnergyStar rated gas tankless water heating models. Rated 2 out of 5 by ShortestLifeforaW1975 from New Rinnai Water Heater Only Lasted 3 Months I have. When we use hot water we can hear it starting up everytime. RINNAI I120CN. Rheem heaters, in contrast, have a lower heating power capacity, ranging from 11,000 BTU to 190,000 BTU. (Training can be accessed on-line at. Tankless Water Heaters Give Your Clients the Best of the Best Built to commercial-grade standards, Rinnai tankless water heaters are individually tested, backed by the. In fact, Rinnai Tankless Water Heaters use up to 40% less energy than a traditional tank water heater. Plumbing Services. In fact, Rinnai Tankless Water Heaters use up to 40% less energy than a traditional tank water heater. You will have to extend the gas line to accommodate your Rinnai tankless water heater in most cases. The Rinnai itself is fine outside and will never freeze unless power is lost (rated to 40 below). Rinnai tankless water heaters last up to twice as long, have twice the warranty, and save energy as they only heat water when it is needed. Please have your full serial number or model number available for product- orSuper High Efficiency Plus View Energy Guide. The front panel should only be removed for ser-vice/maintenance or replacing internal components. View Tankless Page. Installation requires 3/4 inch cold water supply to unit, plus 1/2 inch hot water to each. Ideal for small to medium homes or remodels. RSC Model Series; RU Model. Peachtree City, Georgia, June 11, 2015 - Rinnai, the number-one selling brand of tankless water heaters in the United States and Canada, has introduced four new models – RUCS/RUS75 and RUCS/RUS65 for both indoor and outdoor applications - that expand its Ultra Series condensing line with mid- and lower-range maximum BTU. The flow rate of Rinnai water heaters is higher and ranges from 6. FREE delivery Mon, Aug 7. 89 $1,180. Enjoy an endless supply of hot water with the RUCS75iN, our Super-High Efficiency condensing natural gas tankless water heater from Rinnail. This user guide provides detailed instructions, diagrams, and troubleshooting tips for the S-Circ Logic recirculation pump. • DO NOT obstruct combustion air to the appliance. 6 Minimum input rate (Btuh) 15,200 Maximum input rate (Btuh) 398,000 TRW02SE Model TRW02SEi TRW02SEe Water Heater Model RU199i (NG/LP) RU199e (NG/LP) Crate Dimensions (HxLxD) - in 66 X 70 X 35 Weight - Fully Assembled - lbs 170. Only the size of a small suitcase, the RUCS75iN is compact, easy-to-install and perfect for indoor locations. $929. Only the size of Welcome to ultimate efficiency. • DO NOT obstruct combustion air to the appliance. Boiler Venting & Accessories; Direct Vent Furnace Accessories. Welcome to ultimate efficiency. Plus, with premium technology, increased energy efficiency, an improved Home Energy Rating. Rinnai is only 93 (depends on model). Please have your full serial number or model number available for product- orHigh Efficiency Plus 9. 5 GPM Residential Outdoor Natural Gas Tankless Water Heater with 150,000 BTU Max Input and Electronic Water Control from the Value Series Model: V65EN. These new Ultra Series condensing tankless water heater models RUC98i and. 67 USD. RL94eN. 5 GPM Natural Gas High Efficiency Indoor Tankless Water Heater: High Efficiency Non-Condensing Smart-Circ 7. • Professional installation recommended, call 84-GO-Rinnai for assistance. Expert Installation Available. In fact, Rinnai Tankless Water Heaters use up to 40% less energy than a traditional tank water heater. Ideal for small to medium homes or remodels, compact, easy-to-install, reliable and perfect for indoor locations; Rinnai products provide peace of mind with warranties that surpass the competition. Close the hot water tap: Once you’re. This Rheem Performance Platinum High Efficiency Tankless Water Heater provides estimated energy cost savings of more than $1,100 over 12 years. Only the size of a small suitcase, the propane fueled RSC160iP model is compact, easy-to-install and perfect for indoor locations. 03 GPM, which is plenty of capacity, even for a large household that requires hot water from multiple fixtures at once. A Rinnai PRO will help you choose the right model for your needs. Save $196. Tankless gas water heaters can have several advantages over traditional tank-style gas water heaters. Now, with Smart-Circ, Rinnai RSC model water heaters learn your water usage patterns to start circulating hot water on your schedule, anticipating your hot water needs for a shorter wait and saving energy during times when you don't. Lower. As a result, customers see two decades plus of service, whereas most tanks are getting replaced in 10 - 15 years. Compare. Stiebel Eltron DHC Trend Point-of-Use Electric Tankless Water Heater. Matters. • Proper installation is the responsibility of This guide applies to storage gas water heaters, instantaneous or tankless gas water heaters, electric resistance water heaters, and electric heat pump water heaters. 81 Results Brand: Rinnai. • DO NOT install this water heater above 10,200 ft (3,109 m). Super High Efficiency 6. 230V AC 50Hz 1ph. Select a region. 6/5 stars from 61 reviews. An excellent, cost-effective option for households of four, the RU130iN is Energy Star certified and can cost as little as $140 per year to run. "100% accurate water temperature control" Continuous flow water heaters are an advanced varient of traditional multipoint waters heaters, they are far more efficient than storage systems and are the. So Navien has the edge if you are installing it in 2023 as you might get a tax break when you do your taxes in 2024. Founded in 1920, Rinnai has. Plus, with premium technology, increased energy efficiency, an improved Home Energy Rating System (HERS). Welcome to ultimate efficiency. My opinion is that this is the best water heater you can get. But, for decades prior, they have been selling tankless in Japan and other parts of the world. (740) 622-5667. _____ Download the SENSEI™ brochure to look inside the vertically integrated components of the new SENSEI with advanced recirculation technology for superior product performance. Discover why millions of families rely on their Rinnai tankless water heater and home heating gas appliances for total home comfort. Technology to Improve Your Lifestyle. REP199eN is the perfect combination of high efficiency, comfort and value in a natural gas non-condensing tankless water heater from Rinnai. RE180iN is the perfect combination of high efficiency, comfort and value in a natural gas non- condensing tankless water heater. 50+ bought in past month. SEE IT. Noritz offers more tankless water heater models and higher flow rate (commercial models are with the 13. 4. High Efficiency View Energy Guide. Rinnai V53DeN Tankless Hot Water Heater, 5. Here are some of the most common Rinnai tankless water heater problems you might run into, as well as troubleshooting help: Most Common Rinnai Tankless Water Heater Problems. 380. RE140eN is the perfect combination of high efficiency, comfort and value in a natural gas non- condensing tankless water heater from Rinnai. Navien has several models with efficiency ratings of up to 96%, while most Rinnai models top out at 93%. While non-condensing tankless water heaters are. Enjoy an endless supply of hot water with the SENSEI™ RU160iP Super High Efficiency Plus condensing tankless water heater from Rinnai. Add to Cart. What are some of the most reviewed products in Rinnai Tankless Water Heaters? Some of the most reviewed products in Rinnai Tankless Water Heaters are the Rinnai High Efficiency Plus 9. Water heater accessory. The water heat-er must be installed according to the exact instructions in this manual. 3 kWh Interior Propane Gas Tankless Water Heater with 1,283 reviews, and the Rinnai High Efficiency Plus 7. Keep small chil-Rinnai11 GPM Interior Commercial 199,000 BTU Natural Gas Tankless Water Heater. RE160iP. 3GPM to 11GPM. Only the size of a small suitcase, is easy-to-install, reliable, and perfect for indoor locations; Rinnai products provide peace of mind with. FREE delivery Mon, Aug 7. Close (turn off) the three water valves attached to your tankless water heater. Knowledge of applicable national, state, and local codes. Free Shipping on items over $199. Rinnai RH-180N - RH-180N 91,300 BTU, Hybrid Indoor Tankless/Tank Water Heater (Natural Gas)- The Rinnai RH180 Hybrid Tank-Tankless Water Heater is a unique combination blending the benefits of advanced technology and simple supply; it pairs an innovative, on-demand tankless system with an ample 40-gallon storage tank. Plus, they save energy by heating water only when it is needed. With a maximum flow rate of 11 gallons. The unit will then run fine. V65eN is the perfect combination of high efficiency, comfort and value in a natural gas tankless water heater from Rinnai. Compare. Euliss Propane is a proud distributor of Rinnai tankless water heaters in North Carolina. With Rinnai Common Venting, up to 8 tankless water heater units share the same vent system. In fact, Rinnai Tankless Water Heaters use up to 40% less energy than a traditional tank water heater. However, higher efficiency usually means slightly less. Find Rinnai Tankless water heaters at Lowe's today. Rinnai's super high-efficiency plus condensing outdoor tankless water heater models offer the most advanced technology. (330) 364-5571. Rinnai® Boilers & Water Heaters. Unlike many competitors, Rinnai makes the vast majority of our key components, allowing for consistent control of quality. (CAUTION: Ensure building occupants do not have access to hot water outlets during this procedure. Peachtree City, Georgia, October 2, 2014 - Rinnai, the number-one selling brand of tankless water heaters in North America, has introduced the first tankless water heater in the industry that allows for both concentric or twin-pipe PVC venting from the same unit. Enjoy an endless supply of hot water with the SENSEI™ RSC160iP Super High Efficiency Plus condensing tankless water heater from Rinnai. Tankless Water Heater Tank Water Heater; Technology: Condensing Tankless RSC RU RUCS RUS: Non-Condensing Tankless RE REP: Gas 50G Storage Tank Electric 50G Storage Tank Fuel Type or Energy Source: Natural Gas: Propane: Natural Gas: Propane: Natural Gas: Propane: Electric: UEF (Uniform Energy Factor) 0. The most effective way to receive hot water is by using tankless or on-demand water heaters. Learn how a Rinnai tankless water heater works in this video. Vertical vs. Rinnai’s super high-efficiency models offer sleek design, maximum output and an array of features ideal for the hot water demands of large homes. RINNAI Super High Efficiency Plus 11 GPM 199,000 BTU Natural Gas Interior Tankless Water Heater. High Efficiency Plus 7. $1,85474. Plus, with premium technology, increased energy efficiency, an improved Home Energy Rating System (HERS) Index Score and optimized LEED eligibility, our tankless solutions can increase your home's value. Rinnai's super high-efficiency plus condensing outdoor tankless water heater models offer the most advanced technology. Call for service when your unit is showing this code. 30 Save $175. When hot water is needed, a built-in flow sensor measures the exact flow rate, and that data combined with temperature readings at the heater's inlet and outlet are processed by the electronic. Viessmann is the best, more expensive, but very reliable. Flow Rate @ 35°F Rise (gallons/min): 11 gal (US)/min. Reviews on Tankless Water Heater Installation in North Richland Hills, TX - Schrader Plumbing, ABC Plumbing, Team Enoch, BillyGo, HEB Plumbing and Sprinkler - Kathlyn SmithBTU Input - 130,000. How a Rinnai Tankless Water Heater Works. V94XiN is the perfect combination of high efficiency, comfort and value in a natural gas tankless water heater from Rinnai. Packing 240 volts, this electric water heater can put out as. $1,854. More Options Available. • BURN HAZARD. With Rinnai Common Venting, up to eight tankless water heater units share the same vent system. 4/5 stars from 460 reviews. Rinnai tankless can last twice as long as tanks, making them a better investment as well as increasing the value of your home. Ideal for small to medium homes or remodels. Learn how to use the recirculation with on-demand accessories for your Rinnai water heater. This allows for significantly fewer wall or roof cuts, less labor, and longer vent lengths than ever possible with single-unit tankless. Explore More on homedepot. Replaced a conventional water heater Tank with a Tankless Rinnai system. Navien vs Rinnai tankless water heaters. There is no influence from any manufacturers in calculating this score. Tankless water heaters raise cold water to the temperature you've digitally set when your demand for water passes either a gas burner or electric element. S. e. $983. Provide endless hot water. 4/5 stars from 391 reviews. ) 9. This score ranges from 0 to 10. Only the size of a small suitcase, is easy-to-install, reliable, and perfect for outdoor locations. ADD TO CART. Consumer financing and rebates are also often available. 00:00. That means all key components are manufactured by Rinnai — to ensure Rinnai quality. RE199iN is the perfect combination of high efficiency, comfort and value in a natural gas non-condensing tankless water heater from Rinnai. Uniform Energy Factor (UEF): 0. Unlike many competitors, Rinnai makes the majority of our key components, allowing for consistent. 4. 4 GPM at a 35° temperature rise. As with any tankless water heater from Rinnai, it is compact and powerful enough to meet the needs of a busy home as it consistently delivers hot water around the home. Rinnai tankless water heaters last up to twice as long as tanks and have twice the warranty length. • BURN HAZARD. Isolate unit from building by turning off hot water line to building. 0 GPM at a 35 temperature rise. Our enhanced control•r™ 2. Step 2: Check Gas in the tank. Enjoy an endless supply of hot water with the RUCS75iP, our Super-High Efficiency condensing propane fueled tankless water heater from Rinnai. RE160iN is the perfect combination of high efficiency, comfort and value in a natural gas non- condensing tankless water heater from Rinnai. In residential applications, insulation must be used for hot water pipes below 36” due to burn risk to children. In. Homeowner Features. 2 Rinnai Tankless Water Heater Installation and Operation Manual WARNING If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or death. In compliance with California’s. 4. ThisShop Rinnai High Efficiency 9. There are two different styles of Rinnai water heater serial numbers. The Tankless Truth is, our tankless water heaters last up to two decades while many tanks are. The minimum GPMs is perfect for low demand uses such as shaving, where warm water is needed but not at a high rate! It is the ideal tankless solution for a home. Ideal for small to medium homes or remodels. It heats water only when it's needed and has a 0. Welcome to ultimate efficiency. com. Add to List. 1-888-837-1451. 81. Technology to Improve Your Lifestyle. 37148. Training on Rinnai Tankless Water Heaters is accessible at • Read all instructions in this manual before installing the water heater. x 9. Only the size of a small suitcase, is easy-to-install, reliable, and perfect for outdoor locations; Rinnai products provide peace of mind with warranties that surpass. Dimensions: 4 in. 5 GPM Residential 180,000 BTU Interior Natural Gas Tankless Water Heater (10) Questions & Answers (37) +5 Hover Image to Zoom $1006. View. Keep small chil- What's the top-selling product within Rinnai Tankless Water Heaters? The top-selling product within Rinnai Tankless Water Heaters is the Rinnai Super High Efficiency Plus 11 GPM Residential 199,000 BTU Natural Gas Interior Tankless Water Heater. With technology that operates only when hot water is needed, super-efficient heating coils, no pilot light and no storage tank to heat and reheat water, you save on energy and utility costs. Rated 5 out of 5 by GoodPurchase4534 from Tankless water heater The savings on the gas bill was immediate, 1/3 less the first month, even less the next month. If you can’t find what you need, contact Rinnai. Add to Cart. Plus, with premium technology, increased energy efficiency, an improved Home Energy Rating System (HERS) Index Score and optimized LEED eligibility, our tankless solutions can increase your home's value. Welcome to ultimate efficiency. Super High Efficiency Plus 10 GPM Residential 180,000 BTU Natural Gas Interior Tankless Water Heater (13) Questions & Answers. 2 gpm, residential 9. Now, with Smart-Circ, Rinnai RSC model water heaters learn your water usage patterns to start circulating hot water on your schedule, anticipating your hot water needs for a shorter wait and saving energy during times when you don't. 37 Save $125. Rheem RTGH-95DVLN 9. Horizontal Installation. With technology that operates only when hot water is needed, super-efficient heating coils, no pilot light and no storage tank to heat and reheat water, you save on energy and utility costs. “Rinnai’s full line-up offers consumers and dealers flexibility in installation and budget options,” added Sonoda. Every Rinnai tankless water heater is individually tested for quality before shipping. Unlike many competitors, Rinnai makes the majority of our key components, allowing for consistent control of quality. 5 in. Turn off the power source for your tankless water heater. These boilers offer efficient heating with a modulating pump for consistent temperature control of water used in the heating system, efficient gas and less electrical consumption. Rinnai recommends 60-80 psi for maximum performance. Roger Wakefield is a Master Plumber with 40+ years of experience as an owner, speaker, and trainer. Manual - Rinnai Condensing Water Heaters 5 The Rinnai water heater is one of the most advanced water heaters available. With Rinnai tankless water heaters, you never run out of hot water. Turn on the gas, bleed the line if necessary and check for leaks. Power supply. V53e/RV53e. Since tankless water heaters only heat water as necessary, they eliminate standby energy losses, too. 2. Integrated temperature control up to 185 degrees F. For information on permitting requirements for othe r water heating system types and configurations, see section 150. $3,481. Whether you need a residential water heater or commercial water heater, you can trust the #1 selling gas tankless water heating brand in North America. 95. Displaying Products 1 - 24 (of 25 Products) Shop Rinnai Propane Tankless Water Heaters at ACWholesalers today & save. 4. com 24 Hour Service - 7 Days a Week. W. This allows for significantly fewer wall or roof cuts, less labor, and longer vent lengths than ever possible with single-unit. Stiebel Eltron DHC Trend Point-of-Use Electric Tankless Water Heater. RE160eN. Rinnai RUC98iN Indoor Natural Gas Tankless Water Heater. Photo: walmart. Get free shipping on qualified Rinnai Tankless Gas Water Heaters products or Buy Online Pick Up in Store today in the Plumbing Department. S. Rinnai Vent-Free Convectors push heat to the farthest reaches of the room, evenly warming larger spaces and maximizing cost-savings. The water heat-er must be installed according to the exact instructions in this manual. The Rinnai Hydronic Air Handler System easily integrates with select tankless water heaters or boilers to deliver energy-efficient warmth. The most advanced models have a 4. Rinnai's super high-efficiency plus condensing outdoor tankless water heater models offer the most advanced technology. ADD TO CART. Consumer financing and rebates are also often available. Steel enclosure. In fact, Rinnai Tankless Water Heaters use up to 40% less energy than a traditional tank water heater. Ideal for small to medium homes or remodels. compact, wall-mounted boiler can be easily installed as a retrofit to replace traditional, less efficient boilers. $1306. Cascade Cables allow up to 24 water heaters to be connected and function. 0 GPM, good for simultaneous use of 2 – 5 fixtures at one time. Enjoy an endless supply of hot water with the RUCS75iN, our Super-High Efficiency condensing natural gas tankless water heater from Rinnail. The price of the units from, $4,000-$8,500, and that includes the installation electric or gas model. Endless Comfort & Performance. Rinnai tankless water heaters last up to twice as long as tanks and have twice the warranty length. This Rheem Performance Platinum High Efficiency Tankless Water Heater provides estimated energy cost savings of more than $1,100 over 12 years. . Some of the most reviewed products in Rinnai Tankless Water Heaters are the Rinnai High Efficiency Plus 9. 5 GPM Residential 180,000 BTU Exterior Natural Gas Tankless Water Heater: High Efficiency Plus 7. Step 4: Address Undersized Gas Systems. Welcome to ultimate efficiency. Definitions of Rinnai Tankless Water Heater Codes. Uniform Energy Factor (UEF): 0. 8 GPM Residential 199,000 BTU/h 58. • Install the vent system per local and na-tional codes. Finish. With tankless, you’ll enjoy continuous hot water and space savings. Rinnai’s durable and innovative system delivers a high-efficiency solution for heating your water. 92: 0.