Superior LVD18CHHD Double-Flame 18" Crescent Hill Logs, HD Fiber
The Superior LVD18CHHD is an 18" Crescent Hill HD set of high-definition logs for Superior's Double-Flame vent-free burner. The burner sends two rows of yellow flame up through the six logs, and the system is heater rated at 99% efficiency, so it can warm the room with the chimney damper closed and keep heating through a power outage.
The logs come without a burner. Pair them with one VD1824 burner, manual or millivolt, in natural gas or propane; Superior lets any Double-Flame log set run on any Double-Flame burner. The set fits a firebox at least 24" wide at the front and 17" high, and it can also be run vented in a wood-burning fireplace with a damper clamp. Superior also makes this style as the 24" Crescent Hill HD (LVD24CHHD), and the 18" Crescent Hill (LVD18CH) and 18" Golden Oak (LVD18GO-B) sets fit the same burner.
Key Features
- Six-piece Crescent Hill HD log set, 18", hand-painted high-definition logs
- Runs on the Superior VD1824 Double-Flame burner, manual or millivolt, natural gas or propane
- Two rows of yellow flame; heater rated at 99% efficiency
- Vent-free with the damper closed, or vented with the GA6080 damper clamp
- Rear and middle logs locate on weld pins on the burner chassis
- Millivolt burner is remote ready for Superior remotes and wall switches
What's Included
- Rear log
- Middle log
- Front log
- Top right log
- Top middle log
- Top left log
- Log placement instructions
What to Order With It
Required – One Double-Flame burner (natural gas or propane):
Optional – Remotes and wall controls (millivolt burner only):
Optional – Installation and finishing:
Specifications
| Model |
LVD18CHHD |
| Order number |
F4635 |
| Series |
Double-Flame vent-free gas logs |
| Log size |
18" |
| Logs |
6, hand-painted high-definition |
| Burner |
VD1824NM/PM manual control or VD1824NR/PR millivolt, sold separately |
| Burner input |
36,000 Btu/h high; 25,000 low on the millivolt burner, 19,000 on the manual |
| 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 |
24" front, 20-1/2" rear, 17" high, 13-1/2" deep |
| Warranty |
Logs and grate: 3 years (see Warranty below) |
Firebox Size and Clearances
| Front width, minimum |
24" |
| Rear width, minimum (measured 13-1/2" back) |
20-1/2" |
| Height, minimum |
17" |
| Depth, minimum |
13-1/2" |
| Side wall |
16" minimum from the fireplace |
| Ceiling |
42" minimum above the top of the fireplace opening |
| 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 36,000 Btu/h this burner alone needs about 1,800 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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Burner and logs: the burner base is centered and secured to the fireplace floor (a sunken fireplace floor has to be raised for access to the controls). The rear and middle logs go on the weld pins on the chassis, the front log sits between the burner and the grate fingers, and the top right, top middle and top left logs rest on the matching landings in the logs below. With the burner on HI, no flame should touch any log.
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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 VD1824 Double-Flame burner: the VD1824NM/PM with manual control or the VD1824NR/PR millivolt, each in natural gas or propane. Any Double-Flame log set runs on any Double-Flame burner, so the same burner takes the 18" and 24" sets.
Will it fit my fireplace?
The firebox needs to be at least 24" wide at the front, 20-1/2" wide at the back (measured 13-1/2" in), 17" high and 13-1/2" 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 36,000 Btu/h the burner alone needs about 1,800 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.
Can I add a remote?
With the millivolt VD1824NR/PR burner, yes. It's remote ready for the RCKIT4001 on/off remote, the TRC thermostat remote and the TSRC touch screen remote, and it works with the GWMT1 and GWMS2 wall controls. The manual-control VD1824NM/PM runs from its control knob.
Will it heat during a power outage?
Yes. Both VD1824 burners light with a piezo igniter and don't need electricity, and 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 VD1824 Millivolt Burner Installation and Operation Manual.
Documents and Downloads
