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The Rinnai RX199iN is a condensing tankless gas water heater that operates on either natural gas or propane thanks to its Smart Sense gas control system. With a flow rate of up to 11.1 GPM and a UEF rating of .98, it is one of the most efficient gas-fired models available for residential hot water. The unit is compact enough to fit indoors or outdoors when paired with the RX-OVC vent cap, and it can support up to seven fixtures running simultaneously without noticeable pressure drop.

Users consistently report reliable performance for families of five or more, with multiple showers running simultaneously and no temperature fluctuations. The unit requires a 120V electrical connection for its control board and fan — proof that even a “gas” appliance needs some electricity to operate. Professional installation is strongly recommended, and the self-diagnostic interface makes maintenance straightforward.

The 55-pound weight and 18.5″ x 30.11″ footprint make it a practical replacement for a bulky tank-style heater. The warranty and support from Rinnai are well-regarded, though the optional Controlr WiFi module must be purchased separately if you want app-based monitoring. For homes already on natural gas, this model delivers the best balance of endless hot water capacity, energy efficiency, and durable construction.

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The Rinnai i150SN is a dedicated condensing gas boiler, not a water heater — meaning it is purpose-built for hydronic heating systems that circulate hot water through baseboards, radiators, or in-floor loops. Its 150,000 BTU modulating wire mesh burner matches heat output precisely to demand, reducing fuel waste and maintaining steady temperatures. The unit includes multizone control capability, allowing up to four separate heating zones to be managed directly from the boiler’s digital interface without an external controller.

Real-world users report dramatic reductions in gas bills, with one owner noting a payback period of roughly 2.5 years after replacing an older oil-fired system. The digital display shows temperature and pressure readings, and the outdoor reset sensor automatically adjusts water temperature based on outside weather conditions — a feature that drives further efficiency gains. The wall-mountable design saves floor space, weighing 68.3 pounds with a 18.5″ x 26.4″ footprint.

The unit is natural gas only (LP conversion requires a separate kit), and professional installation is mandatory due to gas line sizing, venting, and condensate drainage requirements. The warranty is solid: 12 years on the heat exchanger, 2 years on parts, and 1 year on labor. Some early units had E-110 error codes related to gas solenoid valves, but these appear limited to a specific batch. For whole-home hydronic heat, this is a premium gas-fired solution that outperforms older atmospheric boilers by a wide margin.

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The Goodman GR9T960603BN is a two-stage upflow/horizontal gas furnace with a 96% AFUE rating, meaning 96 cents of every fuel dollar becomes usable heat. This is a forced-air furnace rather than a hydronic boiler, but it is directly relevant to the “gas or electric” question because it demonstrates how gas appliances achieve high efficiency through condensing technology. The unit outputs 60,000 BTU of heating and uses a multi-speed ECM motor for quiet, variable airflow control.

Users who self-installed report significant savings compared to contractor-priced units, though some HVAC professionals refused to install customer-purchased equipment. The two-stage gas valve and auto-blower speed provide quieter, more even heating than single-stage furnaces. The 17.5-inch cabinet width fits standard utility closets, and the 110.9-pound weight requires two people for positioning. A few units arrived with missing blower motor fasteners, so a thorough pre-install inspection is wise.

The 10-year parts and unit replacement warranty is a strong safety net, though you must register the product online to activate it. For a homeowner with a smaller home (up to 1,600 sq ft) who wants a reliable gas furnace without paying for premium branding, this Goodman delivers excellent value. It is a gas-fired unit that relies on a 115V electrical connection for the blower and controls — a reminder that even gas furnaces are hybrid systems.

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The Goodman GR9T961004CN is the larger sibling of the 60K model, delivering 100,000 BTU of heating capacity with the same 96% AFUE condensing design. It is a two-stage upflow/horizontal furnace with a multi-speed ECM motor that pushes up to 1,600 CFM of airflow — enough to heat homes in the 2,000-3,000 sq ft range depending on insulation and climate. The 21-inch cabinet width accommodates wider duct connections and the 140-pound weight reflects the larger heat exchanger and blower assembly.

Users consistently praise the unit’s quiet operation and rapid heat recovery. One homeowner reported that the new furnace ran half as often as their old 80% AFUE unit while keeping the house noticeably warmer. The two-stage design means the furnace runs at lower capacity most of the time, reducing temperature swings and extending component life. The aluminized steel primary heat exchanger resists corrosion better than uncoated alternatives, which is critical in condensing applications where acidic exhaust is present.

The LED diagnostic display is slightly difficult to read with the panel fully installed, and a few units arrived with extra screws loose inside the cabinet — likely from the factory. The warranty is identical to the smaller model: 10-year parts and unit replacement. This furnace is not convertible to downflow, so verify your HVAC configuration before purchasing. For larger homes needing robust gas-fired forced-air heat, this Goodman is a workhorse that outperforms its price tier.

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This Goodman 100,000 BTU furnace shares the same core platform as the GR9T961004CN but appears to be an alternative SKU with slightly different packaging or channel distribution. The manufacturer specs list a 175-pound shipping weight, suggesting heavy-duty packaging and possibly a slightly different heat exchanger or blower design. It is also a two-stage upflow/horizontal gas furnace with a multi-speed ECM motor and 96% AFUE efficiency.

Users highlight the straightforward installation process, with multiple buyers noting that the unit fired up perfectly on the first attempt after following the manual. One customer purchased this unit for a crawlspace installation, which required careful maneuvering due to the 175-pound weight and limited clearance — a reminder that “gas or electric” doesn’t matter if you cannot physically fit the unit into its intended location. The design is praised for being easy to service, with accessible components and clear wiring diagrams.

The product arrived damaged for one buyer, but the third-party seller (Voomie Supply) provided excellent resolution. This reinforces the importance of buying from reputable sellers, especially for heavy gas appliances that are prone to shipping damage. The warranty coverage mirrors Goodman’s standard 10-year parts and unit replacement. For a homeowner who wants a proven gas furnace platform with good parts availability, this SKU is a solid choice, provided you verify compatibility with your existing ductwork and gas line sizing.

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The Rheem Prestige RTGH-RH11DVLN is a condensing tankless gas water heater with a built-in recirculation pump, designed to eliminate the cold-water sandwich effect common in tankless systems. It delivers 11.0 GPM at a .94 UEF efficiency rating and includes auto-learn programming that tracks water usage patterns to preheat the system before peak demand times. The unit also features water and gas leak detection that automatically shuts down the heater and displays an error code for diagnosis.

Customer experiences with this model are sharply divided. Some users report excellent performance with multiple simultaneous showers and no temperature issues, appreciating the compact footprint and relatively straightforward installation. However, a significant number of long-term reviews describe repeated failures including cracked heat exchangers, burned plastic flame sensor windows, and main control board replacements. Several customers reported the unit failing completely after only 2-3 years of service, and Rheem’s customer service and warranty resolution process drew heavy criticism for being slow and unhelpful.

The built-in recirculation feature is a genuine advantage for homes with long pipe runs, as it reduces the wait time for hot water at distant fixtures. But the reliability concerns — particularly the heat exchanger failures — are hard to ignore given the premium positioning of the Prestige line. The warranty coverage (25 years heat exchanger residential, 5 years parts, 1 year labor) looks generous on paper, but users reported difficulty actually getting warranty claims honored in a timely manner. This unit may appeal to early adopters willing to gamble on features, but the data suggests the Rinnai RX199iN is a safer bet for long-term reliability.

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The Rinnai EX38DTWN is a direct vent wall furnace that runs on natural gas and delivers 38,400 BTU of forced-air heat. Unlike a central boiler or furnace, this unit mounts directly on an exterior wall and vents combustion gases horizontally through a 3-inch hole — making it suitable for spaces where adding ductwork or piping would be impractical. It covers up to 1,600 square feet and uses modulating technology to adjust heat output in small increments, eliminating the on-off cycling typical of cheaper gas heaters.

Users report impressive heating speed: one owner with a 1,200 sq ft house saw a 10°F temperature rise within 15 minutes. A garage installation warmed a 24×24 space from 47°F to 61°F in one hour with 37°F outside temperatures. The unit is exceptionally quiet compared to forced-air furnaces, and the cool-to-the-touch cabinet makes it safer for homes with children. The built-in programmable thermostat and Wi-Fi integration allow scheduling without a separate thermostat purchase.

The main limitation is the thermostat’s minimum setpoint of 60°F, which makes this heater unsuitable for garages or workshops where lower temperatures (45-50°F) are desired for storage. The direct vent design requires 40 inches of clearance in front of the unit, which can be restrictive in tight rooms. Installation is moderately DIY-friendly if you are comfortable cutting a 3-inch hole through an exterior wall and running a gas line. For supplemental zone heating without the complexity of a full boiler system, this Rinnai wall furnace is an excellent gas-fired solution.