Quick take
Choosing a commercial water heater is rarely just about tank size. You also need to decide between electric storage and gas-fired hybrid operation, and then match the heating input to the building's hot-water demand. The four models in this guide cover both approaches: two Rheem/Rheem-Ruud electric tanks, a Rinnai gas hybrid, and an AO Smith electric storage unit. Before you buy, think about whether your priority is the lowest initial electric-tank price, larger storage capacity, or maximum heating efficiency during peak hours.
Price comparison at a glance
| Product | Listed price | Price bar |
|---|---|---|
| AO Smith DSE-120A 200 | USD 5,850.00 | |
| Rheem Rudd ELD80-D | USD 1,499.00 | |
| Rheem-Ruud ES120-18-G | USD 3,570.00 | |
| Rinnai CHS19980HCXiN Demand Duo H-Series | USD 4,500.00 |
Decision matrix
| Need | Recommended pick | Why it fits |
|---|---|---|
| Lowest listed price among these electric tanks | Rheem Rudd ELD80-D | 80-gallon capacity, 277V and 12.1 kW input |
| Large electric storage with high heating input | Rheem-Ruud ES120-18-G | 120-gallon tank, 18,000-watt input, three elements, 149 gph recovery at 50°F |
| Gas-fired hybrid for peak commercial hours | Rinnai CHS19980HCXiN | 199,000 BTU, UEF 0.97, recirculation-ready, Wi-Fi capable |
| New-in-crate all-electric storage with a high current draw | AO Smith DSE-120A 200 | 120-amp rating, commercial electric storage tank |
Product notes
AO Smith DSE-120A 200 commercial electric water heater
This AO Smith unit tops the listed-price range at USD 5,850.00 and is a new-in-crate commercial electric storage water heater. Its 120-amp current rating is the standout electrical spec, and the product type is clearly electric storage. The main limitation for many shoppers is the price: it costs more than any of the other three models here. Choose it if you're buying on a commercial electric spec that calls for a high-amp AO Smith storage unit, not if you're trying to keep the initial cost low.
Rheem Rudd ELD80-D 80 Gallon commercial electric water heater
The Rheem Rudd ELD80-D is the lowest-priced electric option in this comparison at USD 1,499.00. It has an 80-gallon tank capacity and runs on 277V with 12.1 kW of input, making it a straightforward choice for a commercial setting that doesn't need the higher input of the Rheem-Ruud. Its main limitation is that it's the lowest-powered electric unit here, so if you need faster recovery or a larger tank, the Rheem-Ruud model becomes the more relevant comparison. Start here when your hot-water load fits this 80-gallon tank and you want the lowest listed price in this set.
Rheem-Ruud ES120-18-G 120 Gal commercial electric water heater
The Rheem-Ruud ES120-18-G is the middle-priced electric tank at USD 3,570.00 and brings a 120-gallon tank. It's rated at 18,000 watts with three elements, runs in single or three-phase configurations, and lists a recovery flow of 149 gph at a 50°F rise along with 98% thermal efficiency. That makes it a better fit than the smaller electric tank when you have higher volume demand. The limitation is that it's still an electric unit, so you won't get the gas heating capacity of the Rinnai hybrid. For a large electric storage install, this is the one to weigh against the Rinnai.
Rinnai CHS19980HCXiN Demand Duo H-Series hybrid commercial water heater
The Rinnai CHS19980HCXiN is the only gas-fired choice in this set, with a Demand Duo H-Series hybrid system, 199,000 BTU maximum input, UEF of 0.97, recirculation capability, and Wi-Fi control. It's listed for indoor use on natural gas, so it fits commercial projects where gas service is available and you want the higher BTU input of a gas hybrid. At USD 4,500.00, it's the second-highest listed price here, and it's the only unit specified for natural gas. If you want high efficiency and strong peak-hour output, this hybrid is the one to compare against the electric tanks.
Bottom line
- If the budget is the first constraint, start with the Rheem Rudd ELD80-D.
- Need more electric storage and heating power? The Rheem-Ruud ES120-18-G is the electric tank to compare.
- If gas is available and you want hybrid efficiency with strong peak-hour output, the Rinnai CHS19980HCXiN earns the nod.
- If the spec calls for an AO Smith commercial electric storage unit, the AO Smith DSE-120A 200 is the fit.
