Verified size comparison
Heating-oil tank sizes and dimensions
Compare a small, verified set of residential models. Dimensions are manufacturer-published and are not a substitute for the tank label.
Field notes
How to compare the table
- 01
Orientation changes which side you see as height, even when the steel shell is the same size.
- 02
Nominal gallons describe the model class; practical fill planning leaves headspace.
- 03
Clearance, base, vent, and local code requirements are separate from tank-body dimensions.
Manufacturer-verified models
Residential size comparison
Dimensions are listed as length x width x height. Verify the physical label before using a model-specific chart.
| Model | Shape / orientation | Nominal | Dimensions | Chart max / nominal* | Verified |
|---|---|---|---|---|---|
| Granby204201P Standard 20Plus | obround / vertical | 275 gal | 60 x 27 x 44 in | 273.8 gal | 2026-08-01 |
| Granby204701P Standard 20Plus | obround / horizontal | 275 gal | 60 x 44 x 27 in | 275.0 gal | 2026-08-01 |
| Granby205201P Standard 20Plus | obround / vertical | 330 gal | 72 x 27 x 44 in | 328.6 gal | 2026-08-01 |
| Granby208101 Standard | obround / vertical | 138 gal | 30 x 27 x 44 in | 136.9 gal | 2026-08-01 |
| RothDWT 1000L | rectangular / vertical | 275 gal | 43 x 28 x 61 in | 275.0 gal | 2026-08-01 |
| RothDWT 1000LH low height | rectangular / vertical | 275 gal | 51 x 30 x 54 in | 275.0 gal | 2026-08-01 |
*Chart maximum is the final value on a reviewed gauge chart when available; otherwise the manufacturer nominal capacity is shown. It is not a delivery instruction.
Route-specific question
One distinction that matters
Why can two 275-gallon tanks have different dimensions?
Steel obround, low-height double-wall, and tall double-wall models use different construction and footprints while sharing the same nominal capacity.
Source boundary
Official source material
Model values require manufacturer support; safety and removal guidance uses official public-agency material. Verification date: 2026-08-02.
- Granby Standard 20Plus residential oil tanks
Manufacturer model dimensions and orientation; verified 2026-08-01.
- Granby U.S. vertical tank capacity chart
Manufacturer gallons-by-inch table, stated precision +/-2%; verified 2026-08-01.
- Roth double-wall heating-oil tanks
Manufacturer nominal capacities and body dimensions; verified 2026-08-01.
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