Dimplex Optimyst RGB Pro Box 60" Vapor Fireplace
The Dimplex Optimyst RGB Pro Box 60" (model CBX1500-AM, Dimplex order number 500004269) is the largest and most convincing electric fireplace Dimplex builds. Ultrasonic transducers atomise water into an ultra-fine mist and RGB LEDs light it from below, so what rises off the log set is real three-dimensional vapour that rolls and curls the way smoke does — because it is behaving like smoke. Across more than five feet, the effect is the closest the electric category gets to a genuine fire.
Where the Pro Box differs from the rest of the Optimyst line is that it is also a real heater. The e-MatriX and the Opti-Myst cassettes are flame-only; this one carries a thermostatically controlled heater rated to warm up to 1,000 sq ft, with a default set point of 21 °C and a maximum of 30 °C.
A 40" version is available as the Optimyst RGB Pro Box 40". Note that both sizes carry the same heater and the same 1,000 sq ft rating — the 60" buys you a wider fire, not a warmer room.
Filtered Water Only — Not Tap
This is the requirement that catches people out, and it is different from the rest of the Optimyst range. The Opti-Myst Linear fireplaces will run on normal tap water. The Pro Box will not. Dimplex's owner's manual specifies filtered or decalcified water only.
Mineral content is what kills ultrasonic transducers. Running this unit on hard tap water will scale the transducers and shorten their life, and that is not a warranty repair. On a fireplace at this price, budget for an in-line filter or a softener on the supply when you plan the plumbing — not afterwards.
Will It Fit? Rough Opening
| Framed opening width |
64 7/8" (164.8 cm) |
| Framed opening height |
31 3/4" (80.6 cm) |
| Framed opening depth |
16 1/4" (41.3 cm) |
At nearly 65" of framed width, confirm the header detail with your builder — this opening is wide enough to matter structurally, and the unit is heavy.
Please call us before you frame. Dimplex's figures for the Pro Box come from the sell sheet and the owner's manual, and the two do not fully agree — on the 40" model they differ on the depth by an inch and a half. We have published the sell sheet's dimensions, which are the current (February 2026) set, and we would rather confirm your specific opening with Dimplex in writing than have you cut a wall this size to a number we have not checked for your configuration.
Water Supply
The flame is made of water, so the unit needs a supply of it. Dimplex offers an accessory plumbing kit for a permanent connection, which is the only sensible choice at this size — a 60" Pro Box is not a fireplace you want to be refilling by hand.
Remember the filtration requirement above. Plan the filter and the shut-off into the run so the unit can be isolated for service without taking a wall apart.
Fresh Air Inlet: Required
| Minimum fresh air inlet area |
80 in² (516 cm²) |
Roughly a 9" x 9" free area, and it has to be designed into the surround rather than found afterwards. Sealing a vapour fireplace into an airtight cavity gives poor flame performance and damages the unit.
Electrical Requirements
| Supply |
Dedicated 15 A, 120 V AC circuit |
| Heater |
Thermostatically controlled — default 21 °C, maximum 30 °C |
| Heating coverage |
Up to 1,000 sq ft |
| Flame without heat |
Yes — the vapour flame is cool and runs independently |
Dimplex specifies a full dedicated 15 A circuit for this fireplace. Do not share it.
Location
This is an indoor appliance. The owner's guide states "Do not use outdoors." The water system rules out anywhere that can freeze.
Specifications
| Model |
CBX1500-AM |
| Dimplex order number |
500004269 |
| Series |
Dimplex Optimyst® RGB Pro Box |
| Flame |
Optimyst® water vapour with RGB LED illumination |
| Flame temperature |
None — the vapour itself is cool |
| Heater |
Yes — thermostatic, up to 1,000 sq ft |
| Fuel |
Electric and water — no venting, gas line or chimney |
| Installation type |
Built-in, recessed; plumbed water supply |
| Water quality |
Filtered or decalcified only — never untreated tap water |
| Fresh air inlet required |
80 in² (516 cm²) |
| Location |
Indoor only |
| Remote batteries |
Two AA |
| Options |
Accessory plumbing kit; inner glow log set; rear glass pane GBF1500-GLASS |
| Warranty |
2 years limited |
Documents & Downloads
The owner's manual we host is the one Dimplex issues under the 40" order number, but it is the guide for the Pro Box line and covers both sizes. Dimplex does not publish a standalone single-page technical specification sheet for either size.
Warranty
2 YEAR LIMITED WARRANTY from the date of first purchase. Download the Dimplex warranty document. Note that Dimplex excludes Hawaii, Alaska, Yukon, Nunavut and the Northwest Territories from warranty coverage, and that damage from running the unit on untreated water is not covered.
