1. (a) Direct gas-fired tank heaters and tanks to which they are attached shall be installed only aboveground.
2. (b) Tank heaters shall be permanently marked with the name and address of the manufacturer.
3. (c) Tank heaters may be an integral part of a fuel storage container or a separate piece of equipment attached to the storage container by any means approved by the Railroad Commission.
4. (d) Tank heaters shall be provided with a means for manually turning off the gas to the main burner and pilot.
5. (e) Tank heaters shall be equipped with automatic safety devices to shut off the flow of gas to the main burners should the pilot fail. Where the flow of gas through the pilot exceeds 2,000 Btu per hour, the pilot shall also be equipped with an automatic shut-off device.
6. (f) Pressure-regulating and pressure-reducing equipment shall be separated from the open flame by a substantially airtight fire-resisting partition or partitions.
7. (g) In the case of buildings devoted exclusively to gas manufacturing and distributing operations, the distances prescribed in §9.65 of this title (relating to LP-Gas Storage Distance Requirements) may be reduced, provided that in no case shall containers exceeding 500 gallons water capacity be located closer than 10 feet to such gas manufacturing and distributing buildings.
8. (h) No direct-fired tank heater shall raise the vapor pressure of the product within the storage container to a pressure exceeding the working pressure of the container.

Source Note:The provisions of this §9.204 adopted to be effective January 1, 1976; amended to be effective December 20, 1977, 2 TexReg 4692; amended to be effective March 29, 1982, 7 TexReg 1104; amended to be effective January 1, 1988, 12 TexReg 3157.