What it delivers
The ThermoMate ES400 4-Gallon Mini-Tank Water Heater is a mini-tank heater holding 4 gallons, rated at 1440 on 120 volts.
Small tanks like this serve one sink or a wet bar: hot water on demand from storage, reheated between uses.
It runs on 120 volts, so no new 240-volt circuit is needed in most installs.
From the listing: connections: 1/2" npt; material: Stainless Steel; model: ES400.
The listing gives dimensions of 14.5 in (W) x 18.04 in (H), a weight of 19.8 lb and t&p relief valve, mounting kits and user manual in the box.
Right unit for this house?
Install it when
- One sink far from the main heater
- Wet bars, garages and offices
Look at another unit when
- Showers or whole-house use
- Long continuous draws
Strengths and trade-offs
Strengths
- 4-gallon tank
- 120 V
- Hot water at the tap in seconds
Trade-offs
- Runs out after its stored gallons
- Occupies cabinet space
Install limits
- Figures are the maker's or seller's own. Flow at a rise is our estimate from the input; gas, venting and electrical work needs a licensed professional.
Rated performance
Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.
| Model number | ES400 | Retailer |
|---|---|---|
| Tank | 4 gal | Retailer |
| Dimensions (seller) | 14.5"W x 18.04"H | Retailer |
| Features (seller) | Enamel Coating Glass-lined tank for great insulation and preventing leaking | Retailer |
| Power | 1440 | Retailer |
| Voltage | 120 V | Retailer |
| Product weight | 19.8 lb | Retailer |
| Material | Stainless Steel | Retailer |
| Connections | 1/2" npt | Retailer |
Rival units at this flow
More point-of-use water heaters rated for similar demand
- ThermoMate ES700 6.5-Gallon Mini-Tank Water Heater
- GEESEN GX10 Mini-Tank Water Heater
- Camplux ME60 6-Gallon Mini-Tank Water Heater
- Ranein RC70G-E 7-Gallon Mini-Tank Water Heater
Full point-of-use water heaters spec grid · Every ThermoMate unit in the catalog
Final verdict
A solid mini-tank heater for one sink far from the main heater.
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