Roth oil tank chart
Roth double wall tanks publish a real fill chart: fuel level in inches to gallons for every model. Installers and delivery drivers work from it; homeowners usually read the float gauge on top instead. Both are covered below, using Roth's own numbers.
Fuel level in inches to gallons
| Level | 400L (110 gal) | 620L (165 gal) | 1000L (275 gal) | 1000LH (275 gal) | 1500L (400 gal) |
|---|---|---|---|---|---|
| 10″ | 25 | 25 | 42 | 48 | 60 |
| 20″ | 51 | 51 | 86 | 100 | 129 |
| 30″ | 81 | 81 | 135 | 153 | 196 |
| 40″ | 112 | 186 | 206 | 262 | |
| 50″ | 141 | 236 | 330 |
Anchor rows from the Roth EcoDWT plus 3 fill chart, rounded to whole gallons; one misprinted gallon cell on the 1000L was corrected against the chart's liters column. An empty cell means the model tops out below that level. Roth or your installer can supply the full inch by inch chart.
Maximum fill for each model, per the same chart:
- 400L: 109 gallons at 39″
- 620L: 157 gallons at 56″
- 1000L: 263 gallons at 56″
- 1000LH: 254 gallons at 49″
- 1500L: 412 gallons at 61″
Gauge reading to gallons
The float gauge reads liquid level as a fraction. Converting those fractions through Roth's fill chart, with F at the 95 percent maximum fill level:
| Model | F | 3/4 | 1/2 | 1/4 |
|---|---|---|---|---|
| Roth 400L | 109 | 79 | 50 | 24 |
| Roth 620L | 157 | 116 | 77 | 36 |
| Roth 1000L | 263 | 193 | 128 | 60 |
| Roth 1000LH | 254 | 190 | 124 | 59 |
| Roth 1500L | 412 | 300 | 200 | 96 |
Derived from the Roth fill chart, assuming the gauge F mark sits at the 95 percent fill level. Float gauges are coarse; treat these as reorder guidance, not metering.
Which model do I have?
The model and capacity are printed on the label on the tank itself; check there before trusting any table, this one included. The five residential models:
-
Roth 400L
110 gallons nominal, the smallest; level tops out near 39″
-
Roth 620L
165 gallons nominal; level tops out near 56″
-
Roth 1000L
275 gallons nominal, the tall version; tops out near 56″
-
Roth 1000LH
275 gallons nominal in a low height body; tops out near 49″
-
Roth 1500L
400 gallons nominal, the largest; its chart runs to 412 gallons at 61″
Steel tank instead?
If your tank is a painted steel oval rather than plastic, it is read with a stick in inches, and the computed charts apply:
-
275 gallon vertical chart
The standard upright steel oval, read on a 44 inch scale
-
275 gallon horizontal chart
The same steel oval lying flat, read on a 27 inch scale
All sizes, including the 330s and buried tanks, are on the charts page.
Common questions
Can I stick a Roth tank?
The float gauge is the intended homeowner reading on a Roth; the inches in the fill chart describe fuel level and are what installers and drivers work from at the fill fitting. If you have a level reading in inches, use the official table above. Do not open factory fittings to improvise a stick path on a double wall tank.
How accurate is the float gauge?
It reads level as a coarse fraction, so use the gauge table for reorder timing rather than exact gallons. When you need a precise figure, the metered ticket from your next delivery is the truth.
Why does my 275 gallon Roth only take about 260 gallons?
Roth's own chart caps the 1000L at 263 gallons: tanks fill to 95 percent so warming oil can expand, and the whistle can stop the driver slightly sooner. A fill in the 250s into an empty 1000L is a full tank, not a short delivery.
Can I use the steel 275 chart for a Roth 1000L?
No. The 275 chart converts stick inches on a steel oval. The Roth 1000L shares the nominal rating and nothing else; its shape and heights are different. Use the Roth tables above.