Superior LTF18RS Triple-Flame 18" Rugged Stack Logs, Concrete
The Superior LTF18RS is an 18" Rugged Stack set of concrete logs for Superior's Triple-Flame vent-free burner. The triple burner adds an extra row of flame behind the logs and a glowing ember bed at its base, so the fire has depth from back to front, and the system is heater rated at 99% efficiency with a wood-burning grate look.
The logs come without a burner. Superior pairs 18" Triple-Flame logs with the 18" TF18 burner, offered in millivolt, variable or electronic control for natural gas or propane. The set needs a firebox at least 28" wide at the front, 20" at the back and 19" high, and it's also listed for vented use with a damper clamp. The same style comes as the 24" Rugged Stack (LTF24RS) and 30" Rugged Stack (LTF30RS), and the 18" Wild Timber (LTF18WT) fits the same burner.
Key Features
- Six-piece Rugged Stack log set, 18", detailed concrete logs with wood grain texture and color
- Runs on the Superior TF18 Triple-Flame burner: millivolt, variable or electronic, natural gas or propane
- Triple burner with an extra row of flame behind the logs and a glowing ember bed; heater rated at 99% efficiency
- Variable burner includes a ProFlame remote; electronic burner includes an EcoFlow touch screen remote
- Millivolt burner is remote ready for Superior remotes and wall switches
- Vent-free with the damper closed, or vented with the GA6080 damper clamp
What's Included
- Bottom ember log
- Rear log
- Right front log
- Left front log
- Right crossover log
- Left crossover log
- Log placement instructions
What to Order With It
Required – One 18" Triple-Flame burner (natural gas or propane):
Optional – Remotes and wall controls (millivolt burner):
Optional – Installation and finishing:
Specifications
| Model |
LTF18RS |
| Order number |
F0034 |
| Series |
Triple-Flame vent-free gas logs |
| Log size |
18" |
| Logs |
6, concrete |
| Burner |
TF18 millivolt, variable or electronic, sold separately |
| Burner input |
Up to 30,000 Btu/h |
| Efficiency |
Heater rated, 99% |
| Fuel |
Natural gas or propane, set by the burner |
| Venting |
Vent-free; also listed for vented use with the GA6080 damper clamp |
| Minimum firebox |
28" front, 20" rear, 19" high, 14" deep |
| Warranty |
Logs and grate: 3 years (see Warranty below) |
Firebox Size and Clearances
| Front width, minimum |
28" |
| Rear width, minimum (measured 14" back) |
20" |
| Height, minimum |
19" |
| Depth, minimum |
14" |
| Side wall |
16" minimum from the fireplace |
| Ceiling |
42" minimum above the top of the fireplace opening |
| Floor |
5" minimum |
| Front |
36" to furniture, drapes and other combustibles |
Superior vent-free fireboxes this set fits: VRT2536, VRT2542, VRT3136, VRT3142, VRT3236, VRT3242, VRT3536, VRT3542, VRT4536, VRT4542, VRT4550, VRT6036, VRT6042, VRT6050, VRE4236, VRE4242.
Installation Requirements
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Where it goes: a solid-fuel-burning masonry fireplace, a UL127 factory-built fireplace or a listed vent-free firebox. Not in a factory-built fireplace whose instructions say it hasn't been tested with, or shouldn't be used with, unvented gas logs.
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Rooms: never in a bedroom, bathroom or recreational vehicle. Some state and local codes don't allow vent-free appliances at all, or allow only vented operation.
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Room size: multiply the room's volume in cubic feet (plus any adjoining room open through a doorway without a door) by 20 to get the most Btu/h it can support, then add up every gas appliance in that space except direct-vent ones. At 30,000 Btu/h this burner alone needs about 1,500 cubic feet. If the total is higher, the space needs extra fresh air from an adjoining room or outdoors.
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Chimney prep: before the burner goes into a wood-burning fireplace, have a qualified chimney cleaner clean the flue and firebox of soot, creosote, ashes and loose paint, and repair any damage. Permanently close outside air ducts and ash dumps, and seal fresh-air vents or ash clean-out doors in the firebox with heat-resistant sealant. Don't seal the chimney damper.
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Above the opening: noncombustible material such as slate, marble or tile, at least 1/2" thick, must run at least 12" up from the opening. Between 8" and 12" needs the GA6050 hood; under 8" has to be extended or the logs run vented. A mantel needs at least 8" of noncombustible material below it, plus the hood if that's under 12".
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Vented use: if the fireplace can't meet the vent-free clearances, local codes require venting, or you prefer it, the GA6080 clamp holds the chimney damper permanently open, leaving at least 39 sq in of flue opening on a 6 to 15 ft chimney or 29 sq in on a 15 to 30 ft chimney. In Massachusetts the damper has to be removed or welded fully open for vented use.
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Logs: the bottom ember log goes over the left side of the burner, then the rear log sits on the burner behind it, the right and left front logs go on the base and grate, and the two crossover logs rest on projections in the rear and front logs. With the burner on HI, no flame should touch any log.
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Embers: the system comes with two ember materials. Separate the Platinum Bright Embers and set them on the front flat burner just behind the horizontal ports, and place the Glowing Embers on the front flat burner away from the ports. Put ember material nowhere else, remove all old loose material before reapplying, and replace embers only with Superior's. Volcanic stone and small decorative logs may go around the base, never on the burner or the logs.
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Running it: never burn wood or any other solid fuel in a fireplace with these logs installed, run them only with the fireplace screen in place and any glass doors fully open, and expect possible pilot outages above 4,500 ft.
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Massachusetts: vent-free appliances can't go in bedrooms or bathrooms, installation and repair must be done by a licensed plumber or gas fitter, the flexible gas connector can't be longer than 36", the shutoff must be a T-handle valve, and a working smoke detector is required where the logs are installed.
Frequently Asked Questions
Which burner does it need?
One Superior TF18 Triple-Flame burner. Superior pairs 18" logs with the 18" TF18 and 24" or 30" logs with the 24" TF2430, each in millivolt, variable or electronic control and natural gas or propane.
Which control should I pick?
The millivolt burner runs from its control knob and is remote ready for the RCKIT4001, TRC and TSRC remotes and the GWMT1 and GWMS2 wall controls. The variable burner includes a ProFlame remote with manual and thermostat modes and five flame heights. The electronic burner includes an EcoFlow touch screen remote with manual and thermostat modes and three flame heights.
Will it fit my fireplace?
The firebox needs to be at least 28" wide at the front, 20" wide at the back (measured 14" in), 19" high and 14" deep. It also has to be a wood-burning masonry fireplace, a UL127 factory-built fireplace whose instructions allow unvented gas logs, or a listed vent-free firebox.
How big a room does it need?
Superior uses the National Fuel Gas Code method: the room's volume in cubic feet, counting adjoining rooms open through doorways without doors, times 20 is the most Btu/h the space can support. At 30,000 Btu/h the burner alone needs about 1,500 cubic feet, and any other gas appliance in the space that isn't direct-vent adds to the total. Smaller or very tightly built spaces need extra fresh air brought in.
Can I run it with the damper open?
Yes. The logs are also listed for vented use in a wood-burning fireplace. The GA6080 damper clamp holds the damper permanently open, leaving at least 39 sq in of flue opening on a 6 to 15 ft chimney or 29 sq in on a 15 to 30 ft chimney. Vented operation is required if the fireplace doesn't meet the vent-free clearances or local codes don't allow vent-free logs.
Where do the embers go?
Only on the front flat burner: Platinum Bright Embers just behind the horizontal ports, and Glowing Embers in the areas away from the ports. Too much ember material, or embers anywhere else, can cause soot or carbon monoxide.
Will it heat during a power outage?
Yes. None of the burners needs house power: the millivolt and variable versions run off a standing pilot, and the electronic version runs on batteries in its power supply and remote. Superior says the logs can be your main heat source during an outage; the rest of the time they're meant as supplemental heat alongside your furnace.
Is a smell normal the first few times?
A slight smell or haze during the first fires comes from manufacturing residue and the logs curing, and it goes away. Odors later on usually come from things in the room air, such as cleaning products, paint or candles, mixing with the combustion air.
What if the logs start to soot?
Soot means a flame is touching a log. Turn the logs off, let them cool and set each piece back exactly where the placement instructions show; with the burner on HI, no flame should touch any log. Don't add rocks or extra logs on the burner. If it still soots, have a qualified service technician check the burner's air openings.
How do I care for it?
Turn it off and let it cool for at least 30 minutes first. Clean the burner, pilot and air inlet holes with a vacuum, a soft brush or compressed air under 30 psi about every three months while you're using it and before each heating season, and have it inspected by a qualified service person every year. Replace any log that's broken or chipped dime-size or larger, and put each one back exactly as the instructions show.
Warranty
Superior's Limited Three Year Warranty on gas log sets covers defects in materials and workmanship this way:
- Logs and grate: 3 years
- Gas components: 1 year, repair or replacement
- Remote control: 1 year, repair or replacement
- Parts not otherwise listed: 90 days
- Labor: paid at IHP rates for the covered part's warranty period
Wear and tear, misuse, faulty installation and damage from burning wood or other solid fuel aren't covered. The warranty is for the original owner of a gas log set installed in the US or Canada. Full terms are in the TF18 and TF2430 Millivolt Burner Installation and Operation Manual.
Documents and Downloads
