The Monessen Solstice 33" Ventless Gas Insert provides an efficient and reliable way to upgrade your existing fireplace. Its vent-free design ensures that all the heat produced stays in your home. It can help you save money on utility bills while conserving energy for a more sustainable future.
The Solstice uses Monessen's Natural Blaze Burner Technology to produce realistic yellow flames and a glowing ember bed for an authentic fire appearance. It also offers two interior options: a traditional brick liner for a classic look or a reflective black glass liner for a modern, contemporary style.
This gas insert is available with two control systems: millivolt and IPI (Intermittent Pilot Ignition). The millivolt system operates with a standing pilot light to generate its own small voltage to control the gas valve. This makes it completely independent of electricity, ensuring reliable operation even during power outages. The IPI system ignites the pilot light only when the fireplace is in use, reducing gas consumption and improving efficiency. IPI systems are often paired with a remote control for added convenience.
The Solstice includes an 18-inch flexible gas line with an on/off shut-off valve to simplify installation and allow safe and quick control of the gas supply during servicing, emergencies, or routine maintenance. The easy-access control panel ensures straightforward operation to give you quick access to system adjustments or inspections without unnecessary effort.
It delivers more heat into your space without losing energy through a chimney or vent. This design also simplifies installation. It requires fewer modifications and making the insert suitable for a variety of locations.
The Monessen Solstice is CSA-certified for safety and performance. It offers reliable operation, flexible design options, and an effective heating solution.
Features:
Ventless Design: Enjoy greater flexibility in placement with no need for a vent or chimney.
Zero Clearance Installation: Fits seamlessly into tight spaces, making it ideal for almost any room.
Mesh Screen Front: Enhances safety while maintaining a sleek, modern look.
Easy Access Control Panel: Convenient operation with controls designed for quick adjustments.
135 CFM Blower: Efficiently distributes warmth throughout your space.
Millivolt or IPI Control Options: Choose the ignition system that fits your preferences.
Field-Installed Accessories
Fireglass Media Options: Add a touch of elegance with your choice of sparkling fireglass.
Versatile Firebrick Panels: Customize the interior with Cinnamon, Colonial Red, Black Magic, or Black porcelain panels.
Stylish Surrounds: Select from two surround designs to complement your décor.
Convenient Remote Controls: Upgrade to remote operation with options like RCB, RCMT, TSMT, RCST, or TSST for personalized comfort.
Specifications:
Model: Solstice/VFI 33
Front Width: 33-3/8" (actual), 33-1/2" (framing)
Back Width: 22-5/8" (actual), 33-1/2" (framing)
Height: 23-7/8" (actual), 24-1/2" (framing)
Depth: 18-1/4" (actual), 16" (framing)
Viewing Area: 31" x 19"
BTU/hr Input: 28,000 (NG) / 27,000 (LP)
**For more detailed specifications, please visit the Tech Specs tab.
**For detailed information and documents, please visit the Downloads tab where you'll find PDFs and additional resources available for download.
SOMETHING TO CONSIDER BEFORE YOU PURCHASE A VENT FREE APPLIANCE:
Vent-Free sets are supplemental zone heaters - They are not intended for continuous use or whole house heating.
Glass doors must be wide open when burning for proper ventilation, proper combustion and cooling of safety controls. With adequate combustion and ventilation air, the damper may be closed for vent-free use. The damper may be opened slightly for reduced venting.
Check local codes and ordinances for permitted uses.
In Most Cases, Vent Free Appliances Are NOT Approved For Bedrooms Or Bathrooms.
Select States And/Or Counties Within States May Not Allow Installation Of Vent Free Products.
This includes but is not limited to: California, Minnesota, Wisconsin.
Other states may have local restrictions such as Arizona, Nevada, Idaho, Alaska, Wyoming, New Mexico, North Dakota and South Dakota. Please check local codes before purchasing a Vent Free Appliance.
Vent free Products AreNot Suitable For People With Allergies Or Breathing Problems
Technical Specifications:
Product Dimension
Front Width (Actual): 33-3/8"
Front Width (Framing): 33-1/2"
Back Width (Actual): 22-5/8"
Back Width (Framing): 33-1/2"
Height (Actual): 23-7/8"
Height (Framing): 24-1/2"
Depth (Actual): 18-1/4"
Depth (Framing): 16"
Viewing Area: 31" x 19"
BTU/hr Input: 28,000 (NG) / 27,000 (LP)
Safety Features
Oxygen Depletion Sensor (ODS):
A safety pilot light automatically shuts off the gas heater if oxygen levels drop below safe levels.
Relighting requires adequate fresh air.
Cold Climate Protection (IPI Models Only):
Designed for operation in cold climates.
Insulate gaps and the base of the appliance for optimal performance.
The intermittent pilot ignition (IPI) control ensures reliable operation, even in extreme cold, combining environmental responsibility with efficiency.
Ignition Controls
Piezo Ignitor:
Enables pilot ignition without matches or batteries.
Millivolt and EcoLogic® 2.0 Controls:
OFF: Shuts off all gas flow.
IGN: Lights and maintains a standing pilot.
ON: Activates ON/OFF functionality via remote or thermostat.
LOW/HI: Adjusts flame height and heat output for realistic glow and yellow flame.
Operation
Vent-free design eliminates the need for outside venting.
High-efficiency performance with clean-burning technology.
Gas Pressures
Natural Gas:
Regulator Pressure: 3.5" w.c.
Pilot Regulator: 3.5" w.c.
Max Inlet Pressure: 10.5" w.c.
Min Inlet Pressure: 5.0" w.c.
LP Gas:
Regulator Pressure: 10.0" w.c.
Max Inlet Pressure: 13.0" w.c.
Min Inlet Pressure: 11.0" w.c.
Note: For LP models, an external regulator is required to reduce supply pressure to 13" w.c.
Key Features
Thermal Generator (Millivolt Models):
Powers remote activation without batteries or electricity.
Adjustable Heat Output:
Both front and rear burners provide customizable heat and flame intensity.
Hearth & Home Technologies LLC (“HHT”) extends the following warranty for HHT gas, wood, pellet and electric hearth appliances (each a “Product” and collectively, the “Product(s)”) and certain component parts set forth in the table below (“Component Part(s)”) that are purchased from a HHT authorized dealer or distributor.
WARRANTY COVERAGE:
HHT warrants that the Products and their Component Parts will be free from defects in materials and workmanship for the applicable period of Warranty coverage set forth in the table below (“Warranty Period”). If a Product or Component Parts are found to be defective in materials or workmanship during the applicable Warranty Period, HHT will, at its option, repair the applicable Component Part(s), replace the applicable Component Part(s), or refund the purchase price of the applicable Product(s). The maximum amount recoverable under this Warranty is limited to the purchase price of the Product. This Warranty is transferable from the original purchaser to subsequent owners, but the Warranty Period will not be extended in duration or expanded in coverage for any such transfer. This Warranty is subject to conditions, exclusions, and limitations as described below.
WARRANTY PERIOD:
Warranty coverage begins at the date of installation. In the case of new home constructions, Warranty coverage begins on the date of first occupancy of the dwelling or six months after the sale of the Product(s) by an independent, authorized HHT dealer or distributor, whichever occurs earlier. However, the Warranty coverage shall commence no later than 24 months following the date of Product shipment from HHT, regardless of the installation or occupancy date. The term “Lifetime” in the table below is defined as: 20 years from the beginning date of warranty coverage for gas appliances, 10 years from the beginning date of warranty coverage for wood and pellet appliances, and 5 years from the beginning of warranty coverage for standalone gas log sets. These time periods reflect the minimum expected useful lives of the designated Component Parts under normal operating conditions.
WARRANTY CONDITIONS:
Because HHT cannot control the quality of any Products sold by unauthorized sellers, this Warranty only covers Products that are purchased through an HHT authorized dealer or distributor unless otherwise prohibited by law; a list of HHT authorized dealers is available on the HHT branded websites.
This Warranty is only valid while the applicable Product remains at the site of original installation. • This Warranty is only valid in the country in which the HHT authorized dealer or distributor that sold the applicable Product is authorized to sell applicable Product.
Contact your installing distributor or dealer for Warranty service. If the installing dealer or distributor is unable to provide necessary parts, contact the nearest HHT authorized dealer or supplier. Additional service fees may apply if you are seeking Warranty service from a dealer other than the dealer from whom you originally purchased the applicable Product.
No HHT consumer should bear cost of warranty service or costs incurred while servicing warranty claims (i.e., travel, gas, or mileage) when the service is performed within the terms of this Warranty. Check with your dealer or distributor in advance for any costs to you when arranging a warranty call. Travel and shipping charges for parts are not covered by this Warranty.
WARRANTY EXCLUSIONS:
This Warranty does not cover the following:
Changes in surface finishes as a result of normal use. As a heating appliance, some changes in color of interior and exterior surface finishes may occur. This is not a flaw and is not covered under the Warranty.
Damage to printed, plated, or enameled surfaces caused by fingerprints, accidents, misuse, scratches, melted items or other external sources and residues left on the plated surfaces from the use of abrasive cleaners or polishes.
Repair or replacement of parts that are subject to normal wear and tear during the Warranty Period are not covered. These parts include: paint, wood and pellet gaskets, firebricks, grates, flame guides, batteries and the discoloration of glass.
Minor expansion, contraction, or movement of certain parts causing noise. These conditions are normal and complaints related to this noise are not covered by this Warranty.
Damages resulting from: (1) failure to install, operate, or maintain the applicable Product in accordance with the installation instructions, operating instructions, and listing agent identification label furnished with the applicable Product; (2) failure to install the applicable Product in accordance with local building codes; (3) shipping or improper handling; (4) improper operation, abuse, misuse, continued operation with damaged, corroded or failed components, accident, or improperly/incorrectly performed repairs; (5) environmental conditions, inadequate ventilation, negative pressure, or drafting caused by tightly sealed constructions, insufficient make-up air supply, or handling devices such as exhaust fans or forced air furnaces or other such causes; (6) use of fuels other than those specified in the operation instructions; (7) installation or use of components not supplied with the applicable Product or any other components not expressly authorized and approved by HHT; (8) modification of the appliance not expressly authorized and approved by HHT in writing; and/or (9) interruptions or fluctuations of electrical power supply to the applicable Product.
Non-HHT venting components, hearth connections or other accessories used in conjunction with the applicable Product.
Any part of a pre-existing fireplace system in which an insert or a decorative gas applicable Product is installed.
HHT’s obligation under this Warranty does not extend to the Product’s capability to heat the desired space. Information is provided to assist the consumer and the dealer in selecting the proper Product for the application. Consideration must be given to the Product location and configuration, environmental conditions, insulation and air tightness of the structure.
This warranty is void if:
The applicable Product has been over-fired, operated in atmospheres contaminated by chlorine, fluorine, or other damaging chemicals. Over-firing can be identified by, but not limited to, warped plates or tubes, deformation/warping of interior cast iron structure or components, rust colored cast iron, bubbling, cracking and discoloration of steel or enamel finishes.
The applicable Product is subjected to prolonged periods of dampness or condensation.
There is any damage to the applicable Product due to water or weather damage which is the result of, but not limited to, improper chimney or venting installation.
LIMITATIONS OF REMEDIES AND LIABILITY:
EXCEPT TO THE EXTENT PROVIDED BY LAW, HHT MAKES NO EXPRESS WARRANTIES OTHER THAN THE WARRANTY SPECIFIED HEREIN. The owner’s exclusive remedy and HHT’s sole obligation under this Warranty or in contract, tort or otherwise, shall be limited to replacement of the Component Part(s), repair of the Component Part(s), or refund of the original purchase price of the applicable Product(s), as specified above; provided, however, that (i) if HHT is unable to provide replacement of the Component Part(s) and repair of the Component Part(s) is not commercially practicable or cannot be timely made, or (ii) the customer is willing to accept a refund of the purchase price of the applicable Product(s), HHT may discharge all such obligations by refunding the purchase price of the applicable Product. In no event will HHT be liable for any incidental or consequential damages caused by defects in the applicable Product. Some States do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This Warranty gives you specific legal rights and you may also have other rights which vary from State to State. THE DURATION OF ANY IMPLIED WARRANTY IS LIMITED TO DURATION OF THE EXPRESSED WARRANTY SPECIFIED ABOVE FOR THE APPLICABLE PRODUCT. Some States do not allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.