Superior Double-Flame Vent-Free Gas Log Burner
Superior Double-Flame VD1824NR 18"/24" Vent-Free Natural Gas Log Burner with Millivolt Control
The Superior Double-Flame VD1824NR is a natural-gas vent-free burner system designed for approved 18-inch and 24-inch Superior gas log sets. It provides a variable input range of 25,000–36,000 BTU/hr, millivolt control, piezo ignition, a dual-yellow-flame burner presentation, and an Oxygen Depletion Sensing (ODS) safety shutoff system.
Model
VD1824NR
Fuel
Natural Gas
Input
25,000–36,000 BTU/hr
Log Sizes
18" / 24"
Control
Millivolt
Ignition
Piezo
Safety
ODS Shutoff
Gas Logs
Sold Separately
Important: Gas Log Set Required
The VD1824NR is the burner system only. A compatible approved 18" or 24" Superior gas log set is required and sold separately.
Natural Gas Only
The VD1824NR is configured specifically for natural gas. Do not connect or convert this model for propane/LP or another gas.
Natural Gas Double-Flame Burner with Millivolt Control
The VD1824NR is designed for buyers building a compatible Superior vent-free gas-log system and who need a natural-gas burner with millivolt control and separately selected decorative logs.
Its Double-Flame burner design creates flame activity around the approved gas-log arrangement while allowing input to vary between 25,000 and 36,000 BTU/hr.
A standing-pilot millivolt control system works with built-in piezo ignition and compatible optional remote or wall controls documented by Superior.
99% heating efficiency: The supplied original product specifications identify the Superior Double-Flame burner at 99% heating efficiency.
Superior VD1824NR at a Glance
Brand
Superior Fireplaces
Product Type
Vent-Free Gas Log Heater / Burner System
Input Rating
25,000–36,000 BTU/hr
Safety System
ODS Safety Shutoff
Is the Superior VD1824NR Right for Your Fireplace?
Best For
- Installations with natural gas service.
- Approved 18" or 24" Superior Double-Flame gas-log configurations.
- Compatible masonry fireplaces.
- Compatible UL127 factory-built fireplaces.
- Projects requiring millivolt burner control.
- Buyers wanting compatible optional remote or wall-control capability.
- Installations where required combustion and ventilation air can be provided.
- Applications meeting all firebox and combustible-clearance requirements.
Do Not Choose This Burner If
- Your fuel supply is propane/LP.
- You want a burner with gas logs already included.
- Your fireplace is smaller than the required dimensions.
- You cannot maintain the required wall, mantel, or floor clearances.
- You cannot provide adequate combustion and ventilation air.
- You intend to use an unapproved gas-log set.
- You intend to mix logs from different models or sizes.
Approved 18" & 24" Gas Log Sets
Superior identifies the following log-set models for use with the VD1824NR burner.
| Log Set Model |
Size |
Log Style |
| LVD18CHHD |
18" |
Crescent Hill HD |
| LVD24CHHD |
24" |
Crescent Hill HD |
| LVD18CH |
18" |
Crescent Hill |
| LVD24CH |
24" |
Crescent Hill |
| LVD18GO-B |
18" |
Golden Oak HD |
| LVD24GO-B |
24" |
Golden Oak HD |
Use only approved logs. Do not mix components from different log models or sizes, and do not modify the manufacturer-specified log arrangement.
Minimum Fireplace Size Requirements
Measure the fireplace before selecting the 18" or 24" log configuration.
| Log Size |
Minimum Height |
Minimum Depth |
Minimum Front Width |
Minimum Rear Width |
| 18" |
17" |
13.5" |
24" |
20.5" |
| 24" |
17" |
13.5" |
28" |
20.5" |
Measurement detail: Rear width is measured at a depth of 13.5 inches. These dimensions are minimum firebox dimensions only and do not replace clearance, mantel, flooring, or combustion-air requirements.
Heating Input & Burner Performance
Minimum Input
25,000 BTU/hr
Maximum Input
36,000 BTU/hr
Burner Style
Double-Flame / Dual Yellow Flame
Heating Efficiency
99% per supplied original specifications
Natural Gas Pressure Requirements
| Fuel Type |
Natural Gas |
| Manifold Pressure |
3.5" W.C. |
| Minimum Inlet Pressure |
5" W.C. |
| Maximum Inlet Pressure |
10.5" W.C. |
| Gas Connection |
3/8" NPT connection to pressure regulator |
Natural gas only: Do not connect the VD1824NR to propane/LP or private non-utility gas wells. The supplied manufacturer information warns that wellhead gas can contain pressure variations or impurities that may damage the appliance.
Millivolt Control & Optional Remote Operation
The VD1824NR uses a millivolt control system with a standing pilot and piezo ignition.
Millivolt Control
Allows the burner to operate using the standing-pilot millivolt system.
Piezo Ignition
Provides built-in pilot ignition for normal appliance lighting.
Remote Capability
Compatible optional controls are documented for applicable millivolt models.
Optional Control Types
Hand-held thermostat remotes, on/off remotes, and compatible wall controls are documented by Superior.
Controls sold separately: Optional remote-control and wall-control accessories are not identified as included with the VD1824NR burner assembly.
Oxygen Depletion Sensing Safety System
The VD1824NR includes an Oxygen Depletion Sensing (ODS) safety shutoff system.
The ODS/pilot is designed to shut the heater off when insufficient fresh air is detected.
The ODS does not replace correct installation. Proper room sizing, combustion air, ventilation, gas pressure, fireplace dimensions, maintenance, and clearances are still required.
Vent-Free Operation & Combustion Air
The VD1824NR is an unvented gas-fired heater. During approved vent-free operation, it uses air from the room where it is installed.
The installation space must therefore provide adequate combustion and ventilation air according to the manufacturer instructions and applicable requirements.
Do not operate in an undersized air space. Additional ventilation air is required when the available indoor-air volume does not satisfy the applicable combustion-air calculations.
Fireplace & Combustible Clearances
Clearance requirements depend on the fireplace construction, combustible projections, mantel depth, noncombustible material, flooring, and final installation configuration.
Minimum Side Clearance
16" from the side of the fireplace cabinet/opening to combustible material.
Materials Above Fireplace
Requirements depend on noncombustible material and combustible projection.
Fireplace Hood
A hood is required in certain configurations when required noncombustible clearances are not available.
Mantel Clearance
Depends on mantel projection and distance above the opening.
Floor Clearance
Depends on combustible-floor conditions and appliance elevation.
Floor-level installation: When combustible flooring extends to less than 14 inches in front of the fireplace, the supplied instructions require the appliance to be installed at least 5 inches above the combustible flooring.
Do not use one mantel dimension for every installation. Follow the specific Superior clearance diagrams for the final fireplace and mantel configuration.
Vented Operation Considerations
Superior's instructions also address operation in a vented configuration where required or permitted by applicable codes.
Vented operation requires the chimney-flue damper to remain permanently open using the applicable damper-clamp arrangement.
Different installation rules may apply: Do not assume vent-free clearances and installation requirements remain unchanged when the system is operated in a vented configuration.
What's Included?
Included
- Superior VD1824NR burner assembly
Not Included
- Compatible gas log set — required
- Optional remote-control accessories
- Installation materials not specifically supplied
- Gas-supply components not specifically identified as included
Installation Requirements
Installation and service must be performed by a qualified installer, service agency, or gas supplier and must comply with the manufacturer instructions and applicable local requirements.
Approved Fireplace
Confirm the fireplace type is permitted by Superior's installation instructions.
Approved Logs
Use the correct approved 18" or 24" log configuration.
Firebox Dimensions
Confirm all minimum width, height, and depth requirements.
Combustible Clearances
Verify side-wall, mantel, wall, trim, and floor requirements.
Combustion Air
Confirm the intended space provides the required combustion and ventilation air.
Gas Supply
Verify natural-gas inlet pressure and all gas connections before operation.
Location & Use Restrictions
The VD1824NR must only be installed where permitted by the manufacturer instructions and applicable codes.
Restrictions can apply to certain rooms, manufactured-housing applications, recreational vehicles, high-elevation installations, and jurisdictions with special vent-free appliance requirements.
Local-code verification: The supplied documentation specifically notes bedroom and bathroom restrictions for vent-free products in the Commonwealth of Massachusetts. Always verify requirements for the installation location before purchase.
Operation & Maintenance
Correct log placement and clean burner components are essential to proper operation.
- Inspect the flame pattern after installation and during routine use.
- Confirm the approved logs remain in their required positions.
- Keep burner ports and air passages clean.
- Keep the pilot assembly and control area free of dust, lint, pet hair, and debris.
- Turn the appliance off and allow it to cool before cleaning.
- Have service and repairs performed by a qualified service person.
Why maintenance matters: Blocked burner openings or incorrect log placement can contribute to soot, delayed ignition, improper flame patterns, or appliance shutdown.
Important Safety Information
- Use the VD1824NR with natural gas only.
- Do not convert or connect the burner to another gas.
- Do not operate where required combustion and ventilation air cannot be provided.
- Do not use unapproved or incorrectly positioned logs.
- Do not mix logs from different models or sizes.
- Do not place log scraps or volcanic stone directly on the burner.
- Do not burn solid fuels while the unvented heater is installed.
- Do not block the fireplace opening or interfere with airflow around the burner.
- Keep combustible materials and flammable liquids or vapors away from the appliance.
- Maintain all required fireplace, wall, mantel, and floor clearances.
- Use qualified professional installation and service.
Complete Superior VD1824NR Specifications
| Brand |
Superior Fireplaces |
| Series |
Double-Flame |
| Model |
VD1824NR |
| Product Type |
Unvented / Vent-Free Gas Log Heater / Burner System |
| Fuel Type |
Natural Gas |
| Input Rating |
25,000–36,000 BTU/hr |
| Compatible Log Size |
Approved 18" or 24" Superior Log Sets |
| Burner Style |
Double-Flame / Dual Yellow Flame |
| Ignition |
Piezo |
| Control |
Millivolt |
| Manifold Pressure |
3.5" W.C. |
| Minimum Natural Gas Inlet Pressure |
5" W.C. |
| Maximum Natural Gas Inlet Pressure |
10.5" W.C. |
| Gas Connection |
3/8" NPT Connection to Pressure Regulator |
| Safety System |
Oxygen Depletion Sensing (ODS) Safety Shutoff |
| Remote Capability |
Compatible Optional Controls Documented for Millivolt Models |
| Gas Logs Included |
No |
| 18" Minimum Firebox |
24" Front W × 20.5" Rear W × 17" H × 13.5" D |
| 24" Minimum Firebox |
28" Front W × 20.5" Rear W × 17" H × 13.5" D |
| Minimum Side Clearance |
16" |
| Heating Efficiency |
99% per Supplied Original Product Specifications |
| Vent-Free Operation |
Supported When Manufacturer Requirements Are Met |
| Vented Operation |
Addressed by Manufacturer Instructions Where Permitted / Required |
Flame Authority Expert Recommendation
Choose the Superior VD1824NR when you have a natural-gas fireplace installation and want an approved Double-Flame burner for a compatible 18" or 24" Superior gas-log configuration with millivolt control.
Its 25,000–36,000 BTU/hr variable input, piezo ignition, ODS safety shutoff, dual-flame presentation, millivolt control platform, and optional remote capability make it a flexible burner choice for qualifying vent-free gas-log installations.
The most important buying step is confirming the approved log model, 18" or 24" configuration, natural-gas supply, minimum firebox dimensions, required clearances, combustion-air availability, gas-pressure requirements, and installation location before ordering.
Official Manufacturer Resource
Superior VD1824NR FAQs
Is the Superior VD1824NR for natural gas or propane?
The VD1824NR is configured for natural gas only. Do not connect or convert this model for propane/LP or another gas.
Does the Superior VD1824NR include the gas logs?
No. The VD1824NR is the burner system, and an approved 18" or 24" Superior gas log set is required separately.
Which gas-log sets are approved for the VD1824NR?
The supplied manual identifies LVD18CHHD, LVD24CHHD, LVD18CH, LVD24CH, LVD18GO-B, and LVD24GO-B.
How many BTUs does the Superior VD1824NR produce?
The burner has a variable natural-gas input rating of 25,000 to 36,000 BTU/hr.
What size fireplace is required for the VD1824NR?
An 18" configuration requires at least 24" front width × 20.5" rear width × 17" height × 13.5" depth. A 24" configuration requires at least 28" front width × 20.5" rear width × 17" height × 13.5" depth.
Does the VD1824NR require combustion air even though it is vent-free?
Yes. The heater uses room air for combustion, so the installation must provide the combustion and ventilation air required by Superior and applicable codes.
What gas pressure does the VD1824NR require?
Manufacturer specifications list 3.5" W.C. manifold pressure and a natural-gas inlet range of 5" W.C. minimum to 10.5" W.C. maximum.
Does the VD1824NR have an ODS safety system?
Yes. It includes an Oxygen Depletion Sensing safety shutoff system designed to shut the heater off when insufficient fresh air is detected.
Can the VD1824NR use a remote control?
The millivolt system supports compatible optional remote and wall-control accessories documented by Superior. These controls are not identified as included.
Can the VD1824NR be operated as a vented gas-log system?
Superior's instructions address vented operation where permitted or required. Vented operation requires the chimney damper to remain permanently open using the specified arrangement and can have different installation requirements.
Can I use propane with the VD1824NR?
No. The VD1824NR is a natural-gas-only model.
Can I use any 18" or 24" gas logs?
No. Use only the manufacturer-approved Superior log-set models identified for this burner, and do not mix components from different models or sizes.
Before You Order
Confirm Before Purchase
- You specifically need the Superior VD1824NR.
- Your fuel supply is natural gas.
- You have selected an approved 18" or 24" Superior log set.
- Your fireplace meets the minimum dimensions for the selected log size.
- You can maintain all required side-wall, mantel, trim, and floor clearances.
- The room provides adequate combustion and ventilation air.
- Your natural-gas supply meets the 5"–10.5" W.C. inlet-pressure requirement.
- You understand that the gas logs are sold separately.
- You understand that optional remote or wall controls are sold separately.
- The installation location is permitted by Superior and applicable local requirements.
Do Not Assume
- That propane/LP can be used with the VD1824NR.
- That the gas logs are included.
- That any 18" or 24" gas-log set is compatible.
- That nominal log size alone establishes fireplace fit.
- That vent-free operation eliminates combustion-air requirements.
- That the ODS replaces proper ventilation and installation sizing.
- That one mantel clearance applies to every installation.
- That vented and vent-free installation requirements are identical.
- That optional remote controls are included.
Final planning check: Use the Superior VD1824NR Installation & Operation Instructions to verify approved logs, firebox dimensions, gas pressure, gas connection, clearances, combustion air, controls, log placement, vented-operation requirements, maintenance, and all safety conditions before installation.
