If you need a 20-inch-diameter water heater accessory, the Eastman drain pan is the closest match: its listed size is 20 inches inside diameter and 22 inches outside diameter. The other products here are compact water heaters, but their supplied details do not confirm a 20-inch diameter. The GE 18-gallon models suit different installation needs, the VEVOR is a small storage heater, and the Westinghouse is a higher-capacity tankless option. Check your available space and heater specifications before buying.
| Product | Best suited for | What the listing specifies |
|---|---|---|
| Eastman drain pan | A gas water heater needing a pan | 20-inch ID, 22-inch OD |
| GE 18-gallon, 120V | Compact installation with a 120-volt supply | 18-gallon capacity |
| GE 18-gallon lowboy, 240V | Low-clearance spaces | 18-gallon capacity, 240 volts |
| Westinghouse tankless gas | Whole-home demand without a storage tank | Up to 7.9 GPM, 180,000 BTU |
| VEVOR 18-gallon heater | Compact stored hot water | 18-gallon capacity, 1,600 watts |
Eastman 20-Inch Water Heater Drain Pan
Best for: People searching for a pan sized around a 20-inch water heater footprint, rather than a water heater itself. This is the only product in the supplied list with a specified 20-inch diameter.
The listing gives the pan as 20 inches inside diameter and 22 inches outside diameter. It is made from high-impact plastic and is described as intended for gas water heaters. The package includes the pan and one 1-inch PVC fitting for a drain-pipe connection. Its stated purpose is to help protect nearby floors and fixtures from water caused by leaks or runoff.
Why it was selected: Its stated inside diameter directly matches the 20-inch measurement in the search phrase. The inside and outside measurements are different, so compare the heater’s actual base diameter with the pan’s inside diameter, and confirm that the full outside diameter fits the installation area.
Limitation: The listing describes this as a drain pan for gas water heaters; it does not establish that it fits every heater with a nominal 20-inch measurement. Confirm the heater base and required drain arrangement before purchase.
GE 18-Gallon 120-Volt Electric Heater
Best for: Buyers who need an electric storage heater for a compact space and have a suitable 120-volt supply. The product information identifies kitchens, bathrooms, laundry areas, cabins, RVs, garages, and sheds as possible locations.
This GE model has an 18-gallon capacity and an adjustable thermostat. The listing says it uses standard 3/4-inch NPT water connections and can connect to a 120-volt supply. It is described as suitable for a single hookup or, depending on household needs, a small house, condo, or apartment.
Why it was selected: It is a compact, point-of-use-style alternative for someone whose underlying need is a small water heater rather than a 20-inch pan. The listed voltage and connection details give buyers specific requirements to compare with their installation.
Limitation: The supplied details do not state the unit’s diameter or overall dimensions. Do not assume it fits a 20-inch-diameter space; verify the manufacturer’s dimensional specifications and the site’s electrical requirements.
GE 18-Gallon 240-Volt Lowboy Heater
Best for: Buyers who need an 18-gallon electric water heater where height is limited. Its lowboy format is specifically described as intended to make use of tight spaces where a taller unit may not fit.
The listed model is a 240-volt, 18-gallon electric heater with an adjustable thermostat and drain valve. GE describes its household size as one to two people and notes standard water and electrical connections for replacement installations. The listing also identifies side-port connections.
Why it was selected: It offers a different space-planning option from the 120-volt GE model. Choose this if height is the main constraint and the installation is designed for a 240-volt appliance. The stated one-to-two-person household guidance can also help narrow the choice.
Limitation: A lowboy shape does not confirm that the heater is 20 inches in diameter. The supplied product details do not give its dimensions, so check the manufacturer’s measurements and connection layout before selecting it for a confined space.
Westinghouse 7.9-GPM Indoor Tankless Heater
Best for: Households considering a gas tankless system for multiple hot-water uses. The supplied product information specifies up to 7.9 gallons per minute, 180,000 BTU, and an intended capacity of three to five fixtures.
The listing describes an indoor natural-gas unit with Wi-Fi app and voice control. It says the controls can adjust temperature, monitor operating status, and receive fault alerts. The stated temperature range is 95 to 149 degrees Fahrenheit, with a claimed temperature stability of plus or minus 1 degree Fahrenheit.
Why it was selected: It is the strongest alternative here for buyers whose real priority is serving several fixtures rather than matching a small tank’s diameter. A tankless design differs fundamentally from the 18-gallon storage models, so compare the household’s simultaneous demand and installation needs.
Limitation: The listing does not provide a 20-inch diameter or tank footprint. This is a gas appliance, and the supplied details alone are not enough to determine whether it suits a particular home’s gas, venting, or installation setup.
VEVOR 18-Gallon Electric Water Heater
Best for: Buyers seeking a small electric storage heater with adjustable temperature control. The listing states an 18-gallon capacity, 1,600-watt heating power, and a rotary control adjustable from 86 to 167 degrees Fahrenheit.
VEVOR describes an immersion heating element and an LED heating display. The listing says the heater can heat water to 167 degrees Fahrenheit and has an enamel glass coating. It is presented for uses including showers, baths, dishwashing, and laundry.
Why it was selected: This is another compact-capacity option to compare with the GE storage models. Its listed capacity and control details may help buyers distinguish it from the 120-volt and 240-volt GE products, although the supplied information does not specify its voltage.
Limitation: The product name uses both “18 Gallon Tank” and “Tankless Water Heater,” while its features describe an 18-gallon storage capacity. Confirm the product’s construction, electrical requirements, and dimensions with the full listing before purchase. No 20-inch diameter is provided.
Buying Guide: How to Choose a 20-Inch Water Heater Fit
Does “20 inch diameter” refer to the heater or the drain pan?
Start by identifying which item needs to measure 20 inches. A drain pan’s inside diameter, outside diameter, and the water heater’s base diameter are separate measurements. In this selection, Eastman specifies a 20-inch inside diameter and 22-inch outside diameter for its pan. The heater listings do not provide a confirmed 20-inch diameter.
Measure the appliance’s actual base at its widest point, then compare it with the pan’s inside measurement. Also measure the available floor area for the pan’s outside edge. Leave room for plumbing, access, and the drain connection as required by the installation. A nominal size alone is not enough to confirm fit.
Should you choose a storage heater or a tankless model?
An 18-gallon storage model holds a stated volume of heated water. The two GE products and the VEVOR product are listed as 18-gallon options, although the VEVOR listing has mixed tank and tankless wording that merits checking. A tankless heater, such as the Westinghouse, is described by flow rate and heating capacity rather than tank volume.
Compare how many fixtures may draw hot water at the same time, how much space is available, and what utilities are present. The Westinghouse listing gives a flow figure and fixture range, but actual suitability depends on the home and installation conditions. Storage capacity alone also does not establish how long hot water will last under a particular household’s use.
Which electrical details should you compare?
The GE models have different stated electrical requirements: one connects to a 120-volt supply, while the lowboy model is listed at 240 volts. The VEVOR features specify 1,600 watts but do not state voltage in the supplied details. Check the full manufacturer specifications and your existing circuit before choosing an electric heater. Do not infer electrical compatibility from a product’s capacity or appearance.
When does a lowboy model make sense?
Choose a lowboy design when height is a constraint, not simply because the installation area is narrow. The GE 240-volt model is specifically described as fitting areas where height is a concern. Its width and depth still need to be confirmed against the site measurements. For a space limited by diameter or floor area, obtain complete dimensions before ordering.
What should you check for a drain pan?
Verify the heater’s fuel type, pan material, inside diameter, outside diameter, and drain connection. Eastman describes its pan as intended for gas water heaters and includes a 1-inch PVC fitting. The listing says the plastic is designed to resist rust, corrosion, and cracking, but that does not replace checking local installation requirements or the manufacturer’s instructions.
Also check where the pan’s drain will lead and whether the plumbing arrangement is appropriate for the installation. A pan is a protective accessory; it does not replace correct heater installation, maintenance, or any required leak-management measures.
How should you compare compact options?
Use the product specifications that directly affect installation and use: capacity or flow rate, dimensions, energy source, voltage, connection type, controls, and intended household size. The GE lowboy emphasizes limited height; the 120-volt GE model emphasizes flexible placement and a 120-volt connection; and the Westinghouse targets multi-fixture use. The VEVOR offers an 18-gallon capacity and rotary temperature control, but its mixed product wording should be resolved before purchase.
Frequently Asked Questions
Is the Eastman product a 20-inch water heater?
No. It is a water heater drain pan. The listing specifies a 20-inch inside diameter and 22-inch outside diameter; it is not a heater.
Which product is explicitly listed as 20 inches in diameter?
The Eastman drain pan is listed as 20 inches inside diameter. None of the supplied water heater listings confirms a 20-inch diameter.
Will a heater with a 20-inch base fit the Eastman pan?
The listing gives the pan’s inside diameter as 20 inches, but buyers should compare the actual base measurement and pan shape before purchase. Do not rely only on a nominal heater size.
Which listed heater is intended for a low-clearance location?
The GE 18-gallon, 240-volt lowboy model is specifically described as suitable where height is a concern. Its complete width and depth are not included in the supplied details.
Which listed product is designed for multiple fixtures?
The Westinghouse indoor gas tankless heater is listed for three to five fixtures and up to 7.9 gallons per minute. Confirm that its fuel and installation requirements suit the home.
Are all five products confirmed to fit in a 20-inch space?
No. Only the Eastman pan has a stated 20-inch measurement, and that is its inside diameter. The supplied details do not confirm the dimensions of any of the four heaters.