Choosing the best 40 gallon water heater means matching the tank to your fuel source, household hot-water demand, and installation setup. A 40-gallon tank is a common size, but first-hour delivery, recovery speed, warranty coverage, and venting or electrical needs can make two models feel quite different in daily use. These five options include electric and natural-gas models, with the GE WiFi model standing out for its connected controls and higher listed first-hour rating.
Table of Contents
Quick Comparison
| Product | Fuel and type | Notable specifications | Availability in supplied listing |
|---|---|---|---|
| GE 40-Gallon Tall Electric Water Heater with WiFi | Electric | Dual 5500W elements; 65-gallon first-hour rating; 12-year limited tank and parts warranty | Available |
| GE 40-Gallon Tall Electric Water Heater, 4500W | Electric | Dual 4500W elements; 57-gallon first-hour rating; 8-year limited tank and parts warranty | Marked unavailable |
| Rheem Professional Classic 40-Gallon Natural Gas Water Heater | Natural gas | Atmospheric vent; 38,000 BTU | Available |
| GE RealMAX Choice 40-Gallon Tall Natural Gas Water Heater | Natural gas | Tall atmospheric model | Marked unavailable |
| Rheem PROE40 T2 RH95 40-Gallon Electric Water Heater | Electric | Dual 4500W elements; 55-gallon first-hour rating; 0.93 UEF | Available |
Availability can change. Check the listing and confirm the model’s specifications before you buy.
Our Picks: Best 40 Gallon Water Heater reviews
1. GE 40-Gallon Tall Electric Water Heater with WiFi — Best for Connected Controls
This GE is a tall, electric 40-gallon tank with built-in WiFi and a digital display. Its SmartHQ app can show hot-water levels, adjust temperature settings, set vacation schedules, and send alerts. Those controls may be useful if you want to check or change settings without going to the heater.
The listed first-hour rating is 65 gallons, supported by dual 5500W stainless steel heating elements. The product description also lists an anode-sensing alert, standard water and electrical connections, and a 12-year limited tank and parts warranty with one year of labor coverage. The higher element wattage and first-hour rating set it apart from the other electric models in this group.
Before choosing it, confirm that your home’s electrical service and installation space are suitable. Connected features are a plus only if you want app-based controls; they are not a substitute for checking the tank’s physical fit or meeting installation requirements.
Pros:
- 65-gallon first-hour rating is the highest listed among these picks.
- App controls include temperature adjustment and vacation scheduling.
- Anode-sensing alert can help flag when the rod needs attention.
- 12-year limited tank and parts warranty.
Cons:
- Requires a compatible electrical setup for its dual 5500W elements.
- WiFi features may add little value if you prefer simple manual controls.
Verdict: Choose this GE if you want an electric 40-gallon tank with connected controls, a strong listed first-hour rating, and longer stated warranty coverage.
2. GE 40-Gallon Electric Water Heater, 4500W — A Simpler GE Option
This GE is a tall electric model with a true 40-gallon capacity and dual 4500W heating elements. Its listed first-hour rating is 57 gallons, and the product description specifies 240V operation and a 25-amp requirement. That makes electrical compatibility an important check before you plan a replacement.
The stated construction details include a corrosion-resistant anode rod, brass drain valve, and inlet tube designed to bring incoming water in from the bottom of the tank. It has an 8-year limited tank and parts warranty plus one year of labor coverage. Compared with the WiFi-enabled GE, this model has a lower listed first-hour rating and does not list connected controls, but it may suit shoppers who want a more straightforward electric setup.
The supplied listing marks this model as unavailable. That status can change, but don’t base a replacement plan on it until you confirm that the unit can be purchased and that its electrical requirements match your home.
Pros:
- True 40-gallon tank capacity.
- 57-gallon listed first-hour rating.
- Includes a corrosion-resistant anode rod and brass drain valve.
- Standard water and electrical connections are noted in the product description.
Cons:
- Marked unavailable in the supplied listing.
- Its 8-year limited tank and parts warranty is shorter than the WiFi-enabled GE’s stated coverage.
Verdict: Consider this model if it becomes available and its 240V, 25-amp requirements fit your home; otherwise, compare the other electric options first.
3. Rheem Professional Classic 40-Gallon Natural Gas Water Heater — Best Listed Gas Option
This Rheem is a 40-gallon tall natural-gas water heater with atmospheric venting and a listed input of 38,000 BTU per hour. It is a different kind of choice from the electric tanks here: the right fit depends on having compatible gas service and an appropriate venting setup, not just enough space for the tank.
The supplied product details are brief, so there is limited information here about its first-hour delivery, warranty, or added maintenance features. That makes it especially important to check the full product listing and installation documentation before comparing it with models that provide more performance details.
Its listed availability makes it a practical option to investigate if you need a natural-gas tank and the atmospheric vent design matches your installation. Have a qualified installer confirm the connection and venting requirements rather than assuming it will work as a direct replacement.
Pros:
- 40-gallon tank capacity in a tall format.
- Natural-gas operation for homes set up for that fuel.
- Atmospheric vent design is clearly identified.
Cons:
- Supplied details do not state a first-hour rating or warranty coverage.
- Requires compatible gas service and venting.
Verdict: This Rheem is worth considering when you need a 40-gallon atmospheric natural-gas model, but confirm its full specifications and installation fit before buying.
4. GE RealMAX Choice 40-Gallon Tall Natural Gas Water Heater — A Basic Gas Candidate
The GE RealMAX Choice is identified as a tall, 40-gallon natural-gas atmospheric water heater. Those details may make it relevant if you are replacing an existing gas tank and need the same general tank style. The supplied information does not list its burner input, first-hour rating, warranty, or specific construction features, so there is not enough detail to rank its performance against the Rheem gas model.
The listing is marked unavailable in the supplied data. If it appears for sale, check its complete specifications and installation requirements before comparing it with other models. In particular, confirm the venting arrangement and dimensions with your installer rather than relying on capacity and fuel type alone.
Pros:
- 40-gallon capacity and tall form are specified.
- Natural-gas atmospheric model for homes with compatible equipment.
- Could be a candidate for a like-for-like replacement if dimensions and connections match.
Cons:
- Marked unavailable in the supplied listing.
- Supplied details do not include performance ratings or warranty information.
Verdict: Treat this GE as a model to investigate, not a confirmed recommendation, until it is available and you can verify its full specifications and fit.
5. Rheem PROE40 T2 RH95 40-Gallon Electric Water Heater — Best Straightforward Electric Pick
This Rheem is a 40-gallon electric tank with dual 4500W heating elements and a 240V connection requirement. Its stated first-hour rating is 55 gallons, which gives you a useful comparison point when estimating how much hot water the tank can deliver during a busy period.
The product information lists an automatic thermostat and a 0.93 uniform energy factor (UEF). UEF is an efficiency measure, but it is most useful when comparing models using the same rating method and similar conditions. The description also calls the heater easy to maintain, though it does not provide details about warranty length or specific maintenance components.
Unlike the GE electric models, this Rheem does not list app controls or an anode-sensing alert. Its more limited feature set may be fine if you simply want a standard electric tank and do not need connected settings. Confirm the required electrical connection and physical dimensions before ordering.
Pros:
- 40-gallon tank with dual 4500W heating elements.
- 55-gallon listed first-hour rating.
- 0.93 UEF is provided for efficiency comparisons.
- Automatic thermostat keeps water at the selected temperature.
Cons:
- Requires a 240V connection.
- The supplied description does not state warranty coverage.
Verdict: This Rheem is a solid option to compare if you want a conventional 40-gallon electric tank with clearly stated element and first-hour specifications.
How to Choose a 40-Gallon Water Heater
Match the fuel type to your home
Start with the fuel source already available at the installation location. Electric models need a suitable electrical connection, while natural-gas models need compatible gas service and venting. Switching fuel types can add installation work, so check what your home supports before comparing features or placing an order.
Compare first-hour delivery, not just tank capacity
The tank’s 40-gallon capacity describes how much water it holds, but it does not tell the whole story about hot-water delivery during a busy stretch. A first-hour rating estimates the amount of hot water the heater can deliver in its first hour of use. In this group, listed ratings range from 55 to 65 gallons for the electric models that provide this figure. Consider your household’s overlapping showers, laundry, and dishwashing needs when comparing them.
Check electrical requirements and heating elements
For an electric model, confirm the voltage, amperage, and element wattage against your home’s existing setup. The listed GE 4500W model specifies 240V and 25 amps; the Rheem electric model also specifies a 240V connection. The WiFi-enabled GE lists dual 5500W elements. Do not assume these units are interchangeable without checking the product requirements and consulting an electrician when needed.
Measure the installation space
“Tall” describes the general tank style, not its exact dimensions. Measure the height, width, access path, and surrounding clearance at the installation site, then compare those measurements with the full product specifications. Also consider whether the connections and vent location can line up with the existing setup. A tank that fits its footprint may still be difficult to move into place or connect.
Review venting needs for gas models
Natural-gas atmospheric models need a compatible venting arrangement. Check the exact vent type and installation instructions, and have a qualified professional verify the setup. Do not choose a gas heater based on capacity alone; the fuel connection, vent, and local requirements all affect whether it is a suitable replacement.
Weigh controls and maintenance features
Extra features can make ownership more convenient, but focus on the ones you will use. The WiFi-enabled GE lists app controls, vacation scheduling, alerts, and an anode-sensing feature. Other models may have more basic controls. Look at the product documentation for the expected maintenance, including how to check the tank’s anode rod and what upkeep the manufacturer recommends.
Compare warranty terms and installation coverage
Warranty length and coverage can differ by model. The listed GE WiFi model has a 12-year limited tank and parts warranty plus one year of labor coverage; the other GE electric model lists an 8-year limited tank and parts warranty plus one year of labor coverage. The supplied descriptions do not state warranty terms for every option, so verify the full warranty and any installation conditions before deciding.
Frequently Asked Questions
Is a 40-gallon water heater enough for a household?
It depends on how many people use hot water and how often showers, laundry, and dishwashing overlap. Compare the first-hour rating with your peak demand, and ask an installer to help size the tank if your current heater often runs out of hot water.
What does a first-hour rating mean?
It estimates how much hot water a heater can deliver during the first hour of use, starting with a full tank. It accounts for both the stored hot water and the heater’s ability to replenish it, so it can be more useful than tank capacity alone when comparing models.
Can I replace an electric water heater with a gas model?
Not necessarily as a direct swap. A gas heater needs compatible gas service and venting, while an electric model needs the correct electrical connection. A fuel change may require additional work, so have a qualified professional assess the installation.
Are these models all the same height and width?
No. The supplied product information identifies some models as tall but does not give complete dimensions for every option. Check the full specifications and measure your space, access route, and connection locations before ordering.
Which model has the highest listed first-hour rating?
The GE WiFi-enabled electric model has the highest listed rating in this group at 65 gallons. The other electric models with stated ratings list 57 gallons and 55 gallons. The supplied descriptions for the two gas models do not provide a first-hour rating.
Which 40-gallon water heater should I choose?
Choose based on your home’s fuel source, peak hot-water needs, connection requirements, space, and warranty priorities. The GE WiFi model has the strongest listed first-hour rating and the most specified controls, while the Rheem electric model is a more straightforward option with key performance details listed.
Final Recommendation
For shoppers seeking an electric 40-gallon tank with connected features and a high stated first-hour rating, the GE WiFi model is the strongest all-around choice based on the supplied specifications. The Rheem PROE40 is a useful alternative if you prefer a conventional electric model, while the Rheem Professional Classic is worth considering when you need an atmospheric natural-gas heater. Confirm availability, installation requirements, dimensions, and full warranty terms before buying.
