Sizing is critical; a tank that is too small leads to cold showers, while one too large wastes energy. Consider heat pump (hybrid) models if replacing electric, as they pay for themselves in energy savings.
Updated Apr 5, 2026
RE199iN
$84.56
Rheem
2 Gal. 120-Volt 1.4 kW 1-Phase Point of Use Commercial Electric Water Heater
EGSP2
$504
Sure Comfort
Sure Comfort Natural Gas Water Heater
SCG40T03ST34U1
$509
EcoSmart
27 kW 6.6 GPM 240-Volt On Demand Electric Tankless Water Heater
ECOS
$515
Rheem
Performance 30 Gal. Tall 4500-Watt Double Element Manufactured Housing Electric Water Heater with 6-Year Warranty
XE30T06MH45U1
$519
CAMPLUX
Smart 4.22 GPM 102,000 BTU Indoor Propane Tankless Water Heater with 2-Year Warranty and Vent Kit
CA422GLP-WT
$519.99
Rheem
Rheem Performance Platinum Tall Natural Gas Water Heater with Ultra Low NOx
XG50T12HN38U2
$1,039
Rheem
Performance Plus 9.5 GPM Smart Non-Condensing Indoor Natural Gas Tankless Water Heater
ECO200DVELN-3
$1,057.39
Rheem
Performance Platinum 50 Gal. Tall 36,000 BTU Liquid Propane Water Heater with 12-Year Warranty
XP50T12HE36U0
$1,059
Rheem
Performance 75 Gal. Tall 76,000 BTU Natural Gas Water Heater with 6-Year Warranty
XG75T06ST76U0
$1,089
Rinnai
Sensei Super High Efficiency Plus 7.1 GPM 130,000 BTU Natural Gas/Propane Indoor/Outdoor Tankless Water Heater
RX130iN
$1,137.78
Rheem
Gladiator 55 Gal. Tall 12-Year 5500W Double Element Electric Water Heater w/ Leak Detection, Auto Shutoff - Pro 3-Pack
XE55T12CS55U0PP3
$2,520.93
Rheem
Rheem 65 Heat Pump
XE65T10HMS00U0
$2,602.99
Rheem
ProTerra 80 Gal. Smart High Efficiency Hybrid Heat Pump Water Heater w/ Leak Detection & Auto Shutoff - 10-Year Warranty
XE80T10HS45U1
$2,619
Rheem
Light Duty 65 Gal. 208-Volt 12 kW Multi Phase Field Convertible Commercial Electric Water Heater
ELD66-FTB
$2,653.88
Rheem
Medium Duty 100 Gal. 80K BTU Natural Gas Commercial Water Heater
G100-80
$2,899
Rheem
Performance 50 gal. Tall 6-Year 34,000 BTU Ultra Low NOx (ULN) Natural Gas Tank Water Heater with Top T and P Valve
$772.75
Rinnai
Rinnai Exterior Propane Gas Tankless Water Heater with Recirculating Pump
$84.56
TITAN
TITAN Tankless Electric
$243
Rinnai
Demand Duo H-Series 119 Gal. Commercial Hybrid Water Heating System
$18,000
Rheem
15 Gal. 208-Volt 3 kW 1-Phase Point of Use Commercial Electric Water Heater
$684
Rinnai
Demand Duo H-Series 119 Gal. Commercial Hybrid Water Heating System
$17,250
Rheem
Heavy Duty 85 Gal. 208-Volt 36 kW 3-Phase Surface Thermostat Commercial Electric Water Heater
$7,030
Rheem
Rheem Performance Platinum Water Heater
$879
Rheem
Rheem 120 Electric
$6,247.08
JEREMY CASS
Camplux Residential Natural Gas Tankless Water Heater 3.18 GPM 82,000 BTU
$652.18
Ariston
Ariston 5 Point of Use Electric
$159.99
ATMOR
29kW 5.4 GPM Electric Tankless Water Heater Ideal for 3 Bedroom Home up to 6 Simultaneous Applications
$499.99
Rheem
Rheem Point of Use Commercial Electric Water Heater
$646
Rheem
Performance Platinum 50 Gal. Tall 36,000 BTU Liquid Propane Water Heater with 12-Year Warranty
$1,059
Rheem
Rheem Performance Plus Smart Non-Condensing Outdoor Liquid Propane Tankless Water Heater
$953
Rheem
Performance Plus 9.5 GPM Smart Non-Condensing Outdoor Natural Gas Tankless Water Heater
$1,337.63
Rheem
Performance Plus 40 Gal Tall 4500-Watt Double Element Electric Water Heater w/ LED Diagnostic System and 9-Year Warranty
$579
Rheem
Rheem Universal Heavy Duty Natural Gas Commercial Water Heater
$8,138.3
CAMPLUX
CAMPLUX Outdoor Portable Propane Tankless Water Heater
$399.99
TITAN
SCR-4 21 kW 5.0 GPM Residential Electric Tankless Water Heater
$446
Rheem
Performance Plus 50 Gal Medium 4500-Watt Double Element Electric Water Heater w/ LED Diagnostic System - 9-Year Warranty
$658.9
VEVOR
10 gal. 1600-Watt Residential Hybrid Tall Electric Water Heater with 1 Year Tank Warranty and 110 volt Connection
$185.99
Rheem
Performance Plus 7.0 GPM Non-Condensing Indoor Liquid Propane Tankless Water Heater
$786.66
thermomate
Mini Tank 4 Gal. Compact Element Point of Use Electric Water Heater with 3 Years Warranty
$209.99
Average lifespan
Tank water heaters last 8 to 12 years on average. Tankless water heaters can last 15 to 20 years. The single most important factor is water quality — hard water dramatically shortens lifespan by accelerating sediment buildup and anode rod consumption.
Error: E1 / Err1 (Thermostat Failure)
The water heater thermostat has failed or is reading out of range. The unit cannot regulate water temperature safely. A failed thermostat can cause dangerously hot water or no heating at all. Professional repair is required.
Error: E2 / Err2 (Overheating Protection Tripped)
The high-limit safety switch (ECO) has tripped because the water temperature exceeded safe limits. This is a critical safety feature. Press the red reset button on the thermostat after the water has cooled, but recurring trips indicate a faulty thermostat.
Error: E3 / C8 (Flue Blockage - Gas)
The flue or exhaust venting system is blocked, preventing proper combustion gas exhaust. This is a carbon monoxide hazard. Stop using the water heater immediately and ensure the area is ventilated. Professional inspection of the venting is required.
Error: E4 (Ignition Failure - Gas)
The gas water heater failed to ignite after multiple attempts. Check that the gas supply valve is open and the pilot light is lit (if applicable). Ensure no flammable vapors are present. Try relighting the pilot per the manufacturer instructions.
Error: E5 / LOC (Flow Sensor Failure - Tankless)
The flow sensor in a tankless water heater is not detecting water flow correctly. The unit may not fire or may produce inconsistent temperatures. The flow sensor assembly may need cleaning or replacement.
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Get started freeWater heaters are the second largest energy user in the home. Heat pump models drastically reduce electricity usage but cost more upfront.
Common Failure Modes
Tank leaks due to internal corrosion are fatal and require complete replacement. Heating elements in electric tanks and thermocouples in gas tanks are common, easily fixable failures.
Sizing is critical; a tank that is too small leads to cold showers, while one too large wastes energy. Consider heat pump (hybrid) models if replacing electric, as they pay for themselves in energy savings.
Tank water heaters last 8 to 12 years on average. Tankless water heaters can last 15 to 20 years. The single most important factor is water quality — hard water dramatically shortens lifespan by accelerating sediment buildup and anode rod consumption.
Top-rated water heaters brands include Rheem, Rinnai, CAMPLUX, MIZUDO, InSinkErator and more. Covala Shopping tracks 381 water heaters from 37+ brands.
Water heaters are the second largest energy user in the home. Heat pump models drastically reduce electricity usage but cost more upfront.
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