Buying guide
Dimplex Optimyst RGB Cassette
Plan the complete custom fire feature: flame, finish, water and the pieces in between.
The decision
Start with the finished fire, then build the shopping list.
The Dimplex Optimyst RGB 20-inch cassette is the flame-producing component of a custom fireplace. It gives you moving water-vapor flames, color and crackling sound; the finished enclosure, decorative treatment and room heating are separate decisions. Multiple cassettes can be linked for a longer feature.
The best place to start is the room: how many sides should see the flame, what should sit around it, and how will you reach the water system after the fireplace is finished? Those choices determine more of the project than the cassette price alone.
Choose the cassette for a custom composition
You want control over the enclosure and visible flame arrangement, and have a designer or installer ready to plan airflow, water, electricity and service access together.
Consider a packaged firebox for a more defined starting point
If you want a specified firebox rather than a loose flame component, compare the separately sold Dimplex Optimyst RGB Pro Box 60-inch fireplace and its included equipment. Do not assume a housing from an older Optimyst system will accept this cassette.
Jump to the complete-project checklist to separate supplied equipment from the choices still to make, or compare refilling with a direct water connection.
See the effect
Let the flame belong to the room.
Think about what surrounds the flame as carefully as the color. A simple media plate creates a different composition from the optional illuminated log set. Neither the finished enclosure nor a decorative ember bed is included with the cassette.
The cassette uses light and moving vapor to create its flame effect. The Bluetooth remote offers natural orange, blue, violet, red and aquamarine. The Flame Connect app adds further color customization and controls for brightness, sound and mood presets. That flexibility can be useful when the same room moves from a quiet evening to entertaining.
One everyday detail worth knowing: the manual says the remote will not operate while the app is open. Close the app before handing control back to the remote.
The system plan
The cassette is one line in the complete project.
| Component | What to account for |
|---|---|
| Flame engine | One RGB cassette; choose cassette count for the design |
| Controls | Remote supplied; plan access to the tethered Bluetooth receiver |
| Water equipment | Refillable container, inline filter and plumbing kit supplied |
| Water arrangement | Choose regular refilling or the documented direct-water installation |
| Visible finish | Media plate supplied; optional log set or a permitted decorative treatment is separate |
| Enclosure | Custom construction and finishing are project work |
| Air path | At least 40 sq. in. of fresh-air inlet per cassette, reaching its underside |
| Power | 120V; hardwire or the specified optional power-cord kit |
| Room heat | No heater in the cassette; arrange heating separately |
| Ownership | Reachable water parts, filter, shutoff and service connections |
Before ordering, ask for an itemized plan covering cassette count, enclosure, decorative treatment, electrical connection, water work and installation. This prevents an appliance-only price from being mistaken for the cost of a finished fireplace.
Included and optional
Avoid buying the water package twice.
Already in the cassette package
- One cassette and remote
- One refillable water container
- One inline filter and one plumbing kit
- Two flame blockers and three slotted flame spacers
- Three transducers total, including two installed
- Three replacement leak-detector pads and the manual
Separate choices to verify
- The Dimplex Optimyst molded log set, if you prefer the log presentation
- The Dimplex Optimyst Cassette Plug Kit, if using the documented plug-in connection
- A permitted decorative treatment for the supplied media plate
- Custom enclosure, finishes and any transparent barrier
- Site-specific plumbing and electrical work
The separately listed copper-plumbing accessory is not another name for the plumbing kit already included here. Have the installer identify the actual connection needed before adding extra water fittings to the order.
Choose the media before the opening is built
The manual specifies a 12¼-inch opening depth for the media plate, or 14¼ inches for the optional log set. Changing that choice after the enclosure is made can affect the work. Keep the current cassette drawing and chosen media together in the installer’s brief.
For another decorative treatment, the manual limits the overall media weight to 10 pounds and says it must not create small particles that could fall into the unit. That is not blanket approval for any stone, glass or loose media sold for another fireplace.
Design the whole feature
Airflow and access need a place in the drawing.
The cassette is nominally 20 inches wide. Its component dimensions are not a finished fireplace opening. The manual’s single-cassette enclosure drawing specifies 20⅜ inches of width, with the depth tied to the media plate or log-set choice. For multiple cassettes, it calls for the combined cassette lengths plus at least ½ inch for maneuverability. Give the installer the exact drawing rather than sizing a cutout from the product name.
Each cassette needs at least 40 square inches of fresh-air inlet with an open path to its underside. Two cassettes therefore need at least 80 square inches in total, with the required path serving both. A grille that looks large enough from the room does not establish that air can actually reach the equipment.
The manual requires at least 16 inches from the bottom of the media plate or log set to a surface above, and recommends 18 inches for optimal performance. Do not fully enclose the flame. A 10-inch-high transparent barrier can help reduce the effect of air currents; vents, ceiling fans and drafts belong in the location discussion.
Plan the electrical connection and the controls together
The cassette is rated 120V and 230W. The manual permits hardwiring or the specified optional power cord, recommends a dedicated properly fused 15-amp circuit, and prohibits using an extension cord. Your installer should plan the actual circuit for the complete installation.
Up to 10 cassettes can be linked and controlled from a single remote or tethered controller. That control limit is not a statement that ten cassettes can share any convenient outlet. Each unit still needs the documented electrical, water and airflow arrangement.
Keep the tethered receiver where its signal will not be obstructed by brick or stone. Keep the serviceable components reachable too: a finished surface that has to be demolished for routine maintenance defeats the purpose of a carefully built custom feature.
Everyday ownership
Choose how you want to supply the water.
Refillable container
You use the supplied container and plan a convenient way to remove and refill it. When it runs empty, the flame effect shuts off and the LEDs signal low water. Leave an access route that works without disturbing the decorative finish.
Direct water connection
Your installer plans the documented water connection, accessible shutoff and appropriate supply. The manual specifies 20–72 psi. For multiple units, it calls for a manifold arrangement and only one inline filter across the system.
Use normal clean tap water. In a hard-water area, the manual recommends a softener and notes that more frequent care may be needed. The included filter does not make the cassette maintenance-free.
The top cover, sump, water container and transducers must be cleaned with soap and water at least monthly, more often if water quality requires it. Plan access for that work before the enclosure is closed. Disconnect power before maintenance and empty water-containing parts before moving the cassette.
Open the water-care instructions with your installer and identify how each part will be reached.
Match the generation
RGB changes which parts belong in the project.
Dimplex documents revised controls, legs and internal components for the RGB cassette. It specifically excludes compatibility with legacy Pro Box housings. An existing opening or an older housing with a familiar Optimyst name is not enough to establish fit.
The RGB cassette is used inside the current RGB Pro Box system, but a packaged Pro Box is a separate purchase with its own configuration and equipment. Compare that complete package if you prefer a defined firebox starting point.
This cassette has no heater. Do not add a legacy heater, glass pane or media accessory simply because another Optimyst system uses it. Ask us to confirm the exact component combination before placing the order.
Our take
Worth choosing when the custom design is the reason.
We like the RGB cassette when the finished feature calls for a flame composition that a standard firebox does not give you. Color, sound and linked modules provide real design choices. The supplied water equipment is useful too, provided the enclosure keeps it within reach.
We would settle the media and water arrangement early, then review the complete project cost. If you mainly want a finished opening and straightforward installation, compare a packaged fireplace alongside the cassette proposal. The right choice should fit both the room and the way you want to look after it.
Ratings cover the Optimyst RGB Cassette family.
Shop the cassette
Continue with the exact configuration.
Start with one RGB cassette, then complete the project. Enclosure construction, installation and separately selected accessories are additional parts of the project.
Warranty and documents
First-year service is part of the support.
The cassette carries a two-year limited warranty. Eligible first-year claims include repair or replacement with on-site or in-home service. The second year provides covered replacement parts; labor, transport and removal are not included. That first-year service benefit is meaningful for equipment installed within a custom feature.
You must provide clear access to serviceable parts. Travel charges may apply beyond 30 miles from the closest authorized service depot. Coverage applies to the original purchaser in the eligible United States and Canadian regions stated in the warranty; proof of purchase, proper installation and maintenance are required. Read the full terms for exclusions and service details.
Before ordering
A few details worth settling first.
Let’s find the right fit for your project.
Tell us the fire feature you have in mind, how many sides you want to see and whether you prefer refilling or a water connection. We can help check the cassette, media and power-kit choices before your installer finalizes the drawing.
Speak to an Expert
Good questions
A clearer choice.
Does the RGB cassette come with a heater?
No. This cassette produces the flame effect without a heater. Plan room heating separately and do not assume a heater for another Optimyst system is compatible.
Do I need to buy a tank and plumbing kit?
The documented package includes a refillable container, inline filter and plumbing kit. Your installer still needs to identify the site-specific water connection and any additional materials.
Can I choose logs after the enclosure is finished?
Choose them earlier. The manual specifies different opening depths for the media plate and optional log set. Changing the visible treatment can affect the enclosure.
Can I reuse an older Optimyst Pro Box housing?
Do not assume so. Dimplex specifically excludes the RGB cassette from legacy Pro Box housings; check the exact models before combining components.