Our readers keep the lights on and my morning glass full of iced black tea. As an Amazon Associate, I earn from qualifying purchases.11 Best 50 Gallon Gas Water Heater | Quit Running Out Mid-Shower

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This Rheem indoor propane model delivers the highest flow rate in the 11-product roundup at 9.5 GPM, powered by a 199,900 BTU burner. For a household with three bathrooms running simultaneous showers plus a dishwasher, this unit handles the load without noticeable pressure drops. The hot-start programming prevents cold water bursts between back-to-back cycles, which is a common complaint with lower-end tankless designs.

Owner reports highlight straightforward installation using PEX fittings, with several DIY installers completing the job in a few hours. The unit is compatible with standard 3/4-inch NPT connections and weighs 46.5 pounds, manageable with a helper for wall mounting. At 8,000 feet elevation, one verified buyer confirmed the propane model operates without derating issues.

The primary trade-off is noise level — several reviews note the burner is louder than a typical dishwasher. This is characteristic of high-BTU propane units but worth factoring in if the heater is installed near a living space. The 15-year heat exchanger warranty adds long-term confidence, but the 1-year labor term means installation defects are the homeowner’s responsibility after the first year.

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The Westinghouse 10.3 GPM model steps beyond basic on-demand heating with full WiFi app control and voice command compatibility. The 199,000 BTU burner uses a 1:20 turndown ratio and a 6-stage combustion system that modulates gas flow precisely to the demand level, meaning you do not waste energy during low-flow tasks like washing hands. The ±1°F temperature stability target is ambitious and owners confirm it holds steady during multi-fixture use.

Built with a phosphorus-deoxidized copper heat exchanger, this unit is engineered for faster thermal transfer and corrosion resistance. The freeze protection rating down to -13°F makes it a strong candidate for colder climate installs in conditioned basements or utility rooms. The 30-liter capacity rating is nominal — the whole-home performance easily supports 4+ bathrooms according to buyer feedback.

Some buyers reported difficulty finding a contractor familiar with tankless conversions, and the specialized 3/4-inch gas line requirement is non-negotiable. A few owners noted a 1-2 minute delay before hot water reaches the tap, which is standard for tankless systems with long pipe runs but worth understanding if you expect instant heat at the furthest fixture. The app connectivity is genuinely useful for adjusting temperature remotely and receiving fault alerts.

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For homeowners who want to avoid indoor venting costs, this outdoor propane unit delivers 8.1 GPM at 180,000 BTU — sufficient for 3 to 5 fixtures running simultaneously. The outdoor design eliminates the need for stainless steel vent pipe, reducing installation complexity significantly. It includes a wired remote control panel that mounts inside the home for temperature adjustments without stepping outside.

The self-modulating technology maintains temperature within ±1°F, and owners report setting the dial to 116°F and never needing to mix cold water. The variable-speed combustion fan and integrated freeze protection make it suitable for year-round outdoor use in most climates, though Westinghouse recommends fully draining the system if temperatures drop below 5°F for extended periods or during non-use.

Installation is straightforward for those comfortable with gas plumbing, as the wall-mount bracket, standard 3/4-inch NPT connections, and clear startup instructions are included. A few buyers noted difficulty finding a contractor willing to install an outdoor unit, but those who self-installed reported a smooth process. The propane model requires a large house-style regulator — a BBQ regulator will not deliver adequate gas volume.

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A. O. Smith addresses the primary long-term maintenance headache of tankless heaters — scale buildup — with its X3 Scale Prevention Technology. This built-in system eliminates the need for annual descaling and isolation valves, a significant savings over the life of the unit. The commercial-grade copper heat exchanger provides 25 times better heat transfer than steel, contributing to the 0.81 UEF rating and lower operating costs.

At 190,000 BTU with an 8.0 GPM flow rate, this unit comfortably handles multiple fixtures. The included natural gas-to-propane conversion kit adds flexibility for homes that may switch fuel sources later. The 15-year residential heat exchanger warranty is standard for premium models, and the concentric vent system (APNC35) simplifies termination through a single wall penetration.

Owner feedback emphasizes the quiet operation and predictable temperature maintenance even with several faucets open simultaneously. The unit is compact at 13.75 inches wide, fitting into tighter spaces than many competitors. The main downside is the DIY-friendly appeal is limited — professional installation is strongly recommended for gas, venting, and electrical connections, and finding an A. O. Smith-authorized installer may take extra effort in remote areas.

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Rheem’s mid-efficiency indoor unit balances performance and price for homes that do not need the peak flow of the largest models. The 7.0 GPM flow rate covers a 2-3 bathroom house comfortably, and the factory-preset 120°F temperature (adjustable from 80°F to 140°F) suits most household needs without extra configuration. The EcoNet smart monitoring system provides leak detection and remote diagnostics, adding a layer of protection against water damage.

The copper and stainless steel construction is built for longevity — one owner reported their previous Rheem tankless lasting 14 years before replacement. The electronic ignition draws 200 watts and has proven reliable over many years. The wall-mount design saves significant floor space, and the unit is heavy enough (over 70 pounds) that two people are recommended for installation. Owners note that brass shut-off valves are preferred over the included plastic ones.

The critical catch is the venting requirement: this unit needs 3-inch by 5-inch double-walled stainless steel venting, which is not standard for all homes. Several buyers were caught off guard by this and had to order the specific vent kit separately. The mid-efficiency design means a slightly lower UEF compared to condensing units, but for many buyers, the lower upfront cost and simpler installation (no condensate drain) offset that efficiency gap.

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Westinghouse’s indoor 7.9 GPM model brings smart home integration to the mid-range price segment. The WiFi app control allows temperature adjustments and status monitoring from a smartphone, and the ±1°F temperature stability technology reduces the cold burst problem that frustrates many tankless users. The 180,000 BTU burner is CSA-certified for safety and includes overheat protection and a variable-speed combustion fan.

The unit supports 3 to 5 fixtures simultaneously, making it a strong fit for a typical 2-bathroom home with a kitchen and laundry. The compact wall-mount design saves floor space, and the copper heat exchanger with freeze protection adds reliability. Owners consistently praise the easy installation process, with several DIY users completing the job using the detailed manual and standard plumbing connections.

A few buyers mentioned the unit takes a minute or two to deliver hot water to distant fixtures, which is a characteristic of all tankless systems with long pipe runs. The smart app sometimes requires initial Wi-Fi setup patience. Overall, the combination of smart features, solid flow rate, and mid-range pricing makes this a compelling alternative to the premium-priced competitors.

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Rheem’s RTG-70DVLN-3 is a natural gas indoor unit backed by one of the stronger warranty packages in this tier: 15 years on the heat exchanger, 5 years on parts, and 1 year labor. The 160,000 BTU output at 7.0 GPM is sufficient for a 2-3 bathroom home. The hot-start programming prevents the cold water sandwich effect during back-to-back showers, which is a common annoyance with entry-level tankless heaters.

The compact enclosure measures 13.5 inches wide and 24.2 inches tall, fitting into tight alcoves. The electronic ignition is reliable, and the unit includes a built-in display for temperature monitoring. Owners report that the installation is straightforward for a qualified professional, though the required special venting pipe (often 3-inch PVC or stainless steel) must be sourced separately and can be pricey.

Some users note that it takes a noticeable amount of time for hot water to reach fixtures at the far end of the house. This is a pipe-run distance issue, not a heater defect, but it is worth measuring your home’s layout. A few buyers received units in damaged packaging, so inspect the box carefully upon delivery and document any exterior damage before opening.

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This is the indoor liquid propane counterpart to the natural gas DVLN-3 model, sharing the same 7.0 GPM flow rate and 160,000 BTU output. For homes without natural gas access, this unit connects to a large propane tank and regulator. One verified owner with a 100-pound tank reported it lasted approximately one month for a household of two adults and four children taking long showers — useful fuel-economy data for those planning tank size.

The 0.82 efficiency rating and non-condensing design keep the installation simpler than a condensing unit. The unit requires a quality 3/4-inch regulator — a standard BBQ regulator will not provide sufficient gas flow and will cause performance issues. Owners recommend budgeting around for the correct regulator and additional cost for the Rheem vent kit.

The biggest concerns in owner feedback revolve around cold spots and noise. One reviewer described the unit as loud with too many cold spots, while others found it worked well after getting the regulator right. A few buyers reported receiving counterfeit or mismatched units, so purchasing from an authorized seller is critical. The 15-year heat exchanger warranty is there, but some negative experiences with Rheem customer service handling defective units suggest keeping your purchase documentation handy.

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The Noritz NR50ODNG is a smaller unit designed specifically for outdoor natural gas installation, producing 5.0 GPM at 120,000 BTU. This is not a whole-home replacement for a large family, but it is an excellent fit for a small home, apartment, or as a point-of-use heater for a specific area. The outdoor mount eliminates indoor venting costs entirely, and the unit weighs just 33 pounds — the lightest in this roundup — making wall mounting a straightforward one-person job.

Owner feedback consistently mentions rapid hot water delivery, typically arriving at the faucet within one minute. After two years of use, one verified buyer reported flawless performance and a gas bill reduction from to around -15 per month. The low NOx design meets emissions standards, and the unit is used by major hotel chains for its reliability. The minimum temperature setting is 115°F, which some users find warmer than ideal for summer showers — a small trade-off for the safety and scale control benefits.

The 5.0 GPM flow rate means you cannot run two full-flow showers simultaneously. If your household demands are modest — one shower at a time plus a sink — this unit delivers excellent value. The remote controller is sold separately, and some owners found it became unresponsive after adjusting temperatures. Parts availability through local supply houses is a plus for ongoing maintenance.

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Rheem’s outdoor propane unit delivers 7.0 GPM with 180,000 BTUs, making it a strong outdoor option for homes with moderate hot water needs. The outdoor installation means no venting pipe costs and no indoor footprint, and the durable gray metal cabinet is built to withstand weather exposure. The hot-start programming helps prevent cold water bursts during consecutive showers.

Owners report being very satisfied with the performance, especially in applications like campground shower houses or small family homes. One buyer at a mountain campground at high altitude confirmed the unit performed better than expected for a four-stall shower house. The compact size and external wall-mount design keep the installation clean and out of the way. A half-day install with a 23-gallon propane tank provided enough hot water at 130°F for regular household use.

The primary risk with outdoor propane installations is freeze protection. One owner in South Carolina experienced a catastrophic failure when the unit froze in 20°F weather, and Rheem denied the warranty claim because freeze protection is only rated to 30°F. If you live in a region where temperatures drop below freezing, you must winterize or drain the unit. The warranty situation with Rheem customer service was described as poor by some buyers, so verify your local support options before committing.

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The Suburban SW12DE is a completely different product category — a 12-gallon storage tank with both gas (12,000 BTU) and electric heating elements, designed for RVs, campers, and small cabins. It is not a whole-home tankless unit, but for readers seeking an entry-level budget option for a secondary dwelling, this hybrid unit provides flexibility with pilot or electronic dark spark ignition. The steel tank has a porcelain lining and an anode rod to resist electrolysis.

Owner feedback is generally positive for RV applications, with buyers noting easy direct replacement installation, fast heat-up time, and good build quality. The three-year limited warranty on the tank is typical for this class. One buyer reported the unit came in three days with no shipping damage and worked great immediately. Another user with a toy hauler completed the swap in about one hour.

The reliability concerns come from multiple reports of the tank’s original welds failing, causing leaks at the seams. One buyer was on their third Suburban unit with the same failure pattern, and the warranty support was described as unhelpful, offering only a partial refund with no labor reimbursement. For permanent residential use, a tankless unit is a far more durable investment. This Suburban model is best reserved for its intended recreational vehicle application.