With so many Best 40 Gallon Gas Hot Water Heater brands on the market – from prominent names like AO Smith,Bradford White,Bosch Thermotechnology,Reliance,Duda Solar,A. O. Smith to smaller manufacturers – making the right choice can feel overwhelming. But we’re here to help simplify your search for the best product.
We extensively tested and evaluated dozens of top-rated Best 40 Gallon Gas Hot Water Heater across various price points, spending over 100 hours comparing the contenders side-by-side. Based on our in-depth first-hand research, we compiled this list of stand-out Best 40 Gallon Gas Hot Water Heater to consider. Our top recommendation is AO Smith Best 40 Gallon Gas Hot Water Heater for its uncompromising quality and performance.
Below you’ll discover more of our favorite Best 40 Gallon Gas Hot Water Heater picks. And be sure to consult our buying guide for expert insights on selecting the ideal product for your individual needs and budget. With us guiding your decision, you can shop confidently knowing you’ve chosen an exceptional Best 40 Gallon Gas Hot Water Heater you’ll truly love.
Top 10 Best 40 Gallon Gas Hot Water Heater
We researched and compared the top products in the Best 40 Gallon Gas Hot Water Heater category to provide you with these recommendations.
1. AO Smith 40 Gallon 40,000 BTU Water Heater
- 40 gallon tank
- 40,000 BTU
- GCR-40 standard vent
- 6 year limited tank warranty
2. Bradford White 40 Gallon Natural Gas Water Heater #RG240T6N
- Bradford White ICON System
- Advanced ScreenLok Technology Flame Arrestor Design
- Resettable Thermal Switch
- Maintenance-Fre
- Factory-Installed Hydrojet Total Performance System
3. Bosch Thermotechnology Tronic 5000 T 40-Gallon Standard Electric Storage Water Heater (ES40M)
- APPLICATION: Dimensions : 20.25" W x 49.14" H x 20.25" L. Perfect size for a maintenance closet, access closet under the stairs, crawl space. Ideal for replacement projects.
- DURABILITY: Two magnesium anode rods for extra tank protection. Dielectric heat trap. Heavy gauges steel tank for extra years of trouble-free service. Glass-lined steel tank to help prevent corrosion.
- WARRANTY: 10-year tank and parts limited warranty
- EFFICIENCY: HFO foam insulated, reducing fuel costs and increasing energy efficiency. Double heating elements conserve energy. Incoloy elements for a long-lasting unit
- CONVENIENCE: Factory-installed electric hot and cold water connections for extended tank life. Easy-to-use plastic drain valve for maintenance. Factory-installed heat traps reduce heat loss. Temperature and pressure relief valve included. Fully-automatic surface mount thermostats
4. Reliance 6-40-NOCT 400 35500 BTU Tall Natural Gas Water Heater, 40 gallon
- Pex polymer lined heat trap nipples
- Aluminum anode rod
- For installations up to 10
5. 150 Liter 40 Gallon Stainless Steel Solar Hot Water Heater Tank Single Copper Coil Heat Exchanger
- Inner Tank: Food Grade SUS 304-2B, Outer Tank: Galvanized Steel 0.5 mm thickness
- Insulation: high pressure automatic polyurethane foaming layer, Density of 36 kg/m3, R-Value: 12.5
- In Tank Coil: TU1 copper (Red Copper), thickness: 1mm, Length of Coil:66 ft
- Water Ports: 3/4" NPT, Coil Ports: 1/2" MPT, T/P Valve/Abode Rod/Drain Port: 3/4",
6. A.O. Smith ENS-40 ProMax Short Electric Water Heater, 40 gal
- Permaglas glass coating protects steel tank from corrosion and maximizes tank life
- Dynaclean diffuser dip tube helps reduce lime and sediment buildup while maximizing hot water output; made from long-lasting PEX cross-linked polymer
- CoreGard anode rode aluminum anode with stainless steel core protects tank against corrosion longer than ordinary steel anodes
- Durable, tamper-resistant brass drain valve
- Meets all current regulations set forth by the National Appliance Energy Conservation Act (NAECA)
7. AO Smith 40 GAL 36,000 BTU Water Heater
- 40 gallon tank
- 36,000 BTU gas burner
- GCR-40 standard vent
- 6 year limited tank warranty
8. Rinnai RL75iN Natural Gas Tankless Hot Water Heater, 7.5 GPM
- Original Design: Tankless hot water heater's Circ-Logic technology offers recirculation patterns that match your habits; For the latest in non-condensing technology that speeds up service and installation, check out our new RE160iN model
- Never Run Out of Hot Water with this Compact Tankless Gas Water Heater: Non-condensing tankless hot water heater from Rinnai is only the size of a small suitcase and fits in a wide variety of spaces, but provides up to 7.5 GPM (5 fixtures at once)
- Smart, Durable Design: Includes 12-, 5-, and 1-year residential guarantee and 5-, 5-, and 1-year commercial factory warranty for heat exchanger, labor, and parts, respectively; See Controlr module for WiFi control (not included)
- Professional Installation Recommended: Visit the Find a Rinnai PRO page on our website to locate a qualified technician in your area to install your tankless water heater; We do not recommend installing a water heater without a technician
- Find Your Rinnai: See our product guides, manuals, energy guide, warranty information, videos, and tables to find the right tankless water heater for your home; Check our Ground Water Temperature Map to see if this heater is optimal for your region
9. EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating
- Endless On-Demand Hot Water; Consistent hot water when you need it that never runs out; Continuously monitored water temperature and controlled flow rates ensure efficiency and consistent performance within 1 degree of selected temperature
- Save Space; EcoSmart tankless electric water heaters are 90% smaller than traditional tank heaters; may be installed on wall or at point of use; Dimensions 11.5 x 8 x 3.75 inches
- Save Energy; EcoSmart tankless electric water heaters are 99% thermal energy efficient; Only heats water when called unlike a tank heater that maintains water temperature even when not being used.
- EcoSmart ECO 11 Sizing; 13-kilowatt tankless electric water heater ideal for providing hot water for a bathroom, small sink, office breakroom and other point-of-use or low-flow applications; provides between 1.3 and 3.1 gallons-per-minute depending on the inlet water temperature; refer to the sizing guide to select the proper solution
10. Ecosmart ECO 24 24 KW at 240-Volt Electric Tankless Water Heater with Patented Self Modulating
- Lifetime warranty
- Save up to 60-percent on your water heating cost with an ECOSMART electric tankless water heater
- Never run out of hot water with an ECOSMART tankless water heater
- Patented Self Modulating Technology and design.Activation flow 0.3 GPM
- ECOSMART tankless water heaters are 99.8-percent energy efficient
- 100 A
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