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12000 BTU Marine Air Conditioner. The CTM CT-12 provides 12,000 BTUs of powerful, quiet, and efficient cooling. 115V. Titanium circulating coils, stainless steel bolts, and stainless steel structural pan with ABS tray ensure long-lasting, corrosion-proof performance in even the toughest of marine environments.3-Year Warranty*. Patent number.: US 12,030,610 B2.
The quiet, powerful, and efficient CTM CT unit is a great option for new installs but also works as the perfect drop-in replacement for self-contained marine AC units from all of major marine A/C brands including Dometic, Webasto, Cruisair, Marine Air, and Mermaid Air. The CTM is fully compatible with all Dometic, Cruisair, Marine Air, and Micro Air controls/thermostats and cables, making replacement of those systems a breeze.
CTM has taken nearly a decade of experience as a top-selling marine A/C retailer in the US, and combining this with an understanding of the wants and needs of marine A/C customers — as well as where other major brands could be improved — CTM has created a 12,000 BTU self-contained marine air conditioner that raises the bar on quality and performance.
Also Substitutes the following Part Numbers
CTM Unit Part Number
Description
Fits OEM Part number
OEM Description
23101C
CT-12 115V 60HZ 410A
205160128
DOMETIC DTG12 115V 50/60HZ 410A
205160120
DOMETIC DTU12 115V 60HZ 410A
205160121
DOMETIC DTU12 115V 60HZ 410A
205200250
DOMETIC GVTX18 115-230V 50/60HZ
205561550
CRUISAIR STQ12-410A 115V 60HZ
205561555
CRUISAIR STX12-410A 115V 60HZ ONLY
205561500
MARINE AIR VTD12K-410A 115V 60HZ ONLY
MSBA14K2
MARINE AIRE 14,000 BTU's, 115V 60Hz
20022-001
FLAGSHIP FM12 12,000 BTU's, 115V, Cool Only
20022-011
FLAGSHIP FM12 12,000 BTU's, 115V, Cool & Heat Only
FCF0012000GS
WEBASTO FCF Classic 12,000 BTU's, 115V
5011398A
WEBASTO FCF Platinum 12,000 BTU's, 115V
And while lightweight and with a small footprint, the CTM CT includes titanium circulating coils, a high-velocity rotatable turbo blower (rotates less than 250 degrees), stainless steel bolts, and a stainless steel structural pan with Plastic ABS tray in order to ensure long-lasting, corrosion-proof performance in even the toughest of marine environments.
All CTM Control Boards, Temperature Sensors, and cables are made in the United States under strict quality standards. Every CTM Unit comes with an industry-standard 3-year warranty*, knowledgeable and attentive customer service, and ships ground to you free of charge within the US.
As marine A/C retailers, as well as boaters ourselves, we know what boaters are looking for in a marine A/C system — and this is exactly what the CTM line delivers.
CTM CT Unit vs Dometic DTG and Webasto FCF Platinum
Specifications:
Capacity
12,000 BTU
Voltage
100-120 V
Cycle / Phase
60 Hz / 1Ph
Current Consumption Input
10.8 A
Fuse
15 A
RLA / LRA
5.2 A / 26 A
Refrigerant Type
R410A
Refrigerant Charge
12.4 oz / 350 gr
Blower Airflow
380 CFM
Blower Speed
1200 RPM
High Velocity Blower
Yes
Min. Supply Duct Size
5 in / 12.7 cm
Seawater In / Out
5/8" / 5/8"
Condenser Water Flow
5 GPM
Net Weight
50 lbs / 22.67 kg
Features of the CTM CT-12
Titanium Condenser Coil
The most corrosion-resistant material available for seawater cooling coils. 40% more resistant than copper, titanium coils guarantee top cooling performance and a rust-free environment.
Compact Design
Perfect drop-in replacement for all major marine A/C Brands. It's compact design makes it the perfect unit for small spaces.
ABS Insulated Pan
ABS is a versatile thermoplastic product that combines several compounds to offer a durable and corrosion-free material. This insulated pan is designed and made to last for years.
Quiet
Very quiet yet powerful marine air conditioning unit, making it a great option for powerboats and sailboats.
Turbo Blower
High-velocity rotatable turbo blower that will cool or hear faster. Blower rotates less than 250 degrees.
Universal Board
Next generation control board is compatible with most controllers in the market, such as OEM Brands like Dometic, Cruisair, and Marine Air. Also supports the TSEP Temperature sensor. Made in USA.
Reverse Cycle Heating
Enjoy powerful cooling from your CT Unit with the option of heating if needed. Thanks to reverse cycle, you can switch to heating when temperatures get low.
Control and Cable Included
The CT units now come with the Elite II Control and 10ft 8-pin cable included. Since May 1 2026
Dimensions:
A - Depth
20.34 in / 51.65 cm
B - Drain Pan Width
10 in / 25.4 cm
C - Width
11.75 in / 29.8 cm
D - Height
12.4 in / 31.5 cm
E - Min. Duct Diameter
5 in / 12.7 cm
CTM CT Unit Cooling Efficient Design vs Competitors
Because the CTM unit comes with the Universal Control board, it should work with the controller you currently have. Supported controllers include the SMXir, Passport I/O, Smart Touch, and Elite II. However, there are some older versions of the SMXir and Passport i/o controllers that don't have the firmware to work with the new universal board. A newer version of the SMXir or the Passport i/o.
More information on CTM
CTM Marine Air Conditioners - All New, Superior Marine Air Conditioning
The CTM CT-12 12000 BTU Marine Air Conditioner not only improves on the efficiency and performance of other top units on the market, but is a more durable, longer-lasting A/C unit, designed to withstand the harshest of marine environments. CTM units are also fully compatible with controls and thermostats from major marine A/C brands, and can be easily installed yourself, making them the perfect drop-in replacements for units from other brands.
Best Marine Air Conditioners? Best Brand, Support & Warranty?
Boaters often wonder which brand makes the best marine air conditioners when looking to install a new unit.
Most marine air conditioners from all the major brands are solid and will do a decent job, as long as they’ve been installed correctly. However, the keyword here is most. You want to improve your odds of being satisfied with your A/C purchase by researching which company’s units have the least number of complaints… and if there is a problem, how that company handles it.
Notes if replacing a Dometic DTU12, DTG12 or ECD12 - 115V
The CTM CT-12 115V marine air conditioning unit works as a good replacement for the Dometic DTG12 - 115V (205160128), DTU12 - 115V (205160120 12,000 BTU marine AC units. There are some specs that should be taken into consideration when replacing one of the units previously mentioned.
- Because the CT-12 unit comes with the Universal Control board, it will work with the controller you currently have. Supported controllers included: SMXir, Passport I/O, Smart Touch, Elite II.
- Waterline connections should be the same as the unit you are replacing, the CT-unit has a standard 5/8" water connection.
- The CT-12 Unit has a 5-inch ducting ring whereas the Dometic comes with a 6 inch. It is a quick replacement as the ducting can be easily cinched down with a clamp.
- Dimensions wise this unit is very similar to the one you are replacing, so It shouldn't be a major issue. However, it is suggested you double-check in order to avoid any issues when installing.
Warranty
The warranty period of registered CTM products is (3) three years, being the first year parts and labor, the second & third year parts only. For unregistered CTM products (1) one year, being the first 6 months parts and labor, and the last 6 months parts only. The warranty period of CTM products begins from the date of purchase (if purchased through a dealer or distributor), when installed (if installed by an authorized CTM dealer) and/or at the time of possession of the vessel by the owner (for OEM installations). However, the warranty period shall not exceed (3) three years from the original manufacture date. CTM products include a serial number which is date-coded, in order to determine the manufacturer date of the product, you may contact CTM’s customer service to obtain the original date. In the event there is an extended period of time between the date a CTM product is manufactured and the moment that the product goes into service, CTM will require proof of purchase. For unregistered products, a proof of purchase will be required as well.
For more detailed information please download the Manual and refer to page 17.
Micro Air EasyTouch / Smart Touch display replacement. Dometic Smart Touch Replacement. Compatible with Dometic and Cruisair A/C Units. Intuitive icons and menus for easy use, leads you through start-up and troubleshooting. Schedule start-up & shut-down times or temperature changes. CAN Bus compatible. Accommodates Vimar Eikon, Eikon Evo bezels ( sold here ). This model is compatible with Dometic's Passport I/O Board and U-Board. 90-day warranty*. Questions? Contact us. (Wi-Fi Model Requires onboard router for dockside and open ocean use.)
Passport I/O Control Panel replacement by Micro Air, for Dometic and Marine Air Systems. Micro-Air 402-IO. It is newly designed and manufactured. Cures annoying problems like sticking or non-operational buttons. New LED segments and 6 fan speed. Drop-in replacement for the Marine Air Systems Control Panel (Passport I/O). Bezel Included. New control. Part Number: ASY-402-X03 Fits Dometic / Marine Air Part Number: 222000245 & PCB-520-00L
CTM Elite II Marine Thermostat - versatile thermostat designed to replace the original Marine Air Elite and Elite II models. It is compatible with all 8-pin cables, making it easy to install. It features f our different modes of operation, including auto, cool only, heat only, and dehumidify, providing you with plenty of flexibility to meet your heating and cooling needs. 90-day warranty*. 8-Pin Cable (Click Here to buy) , Bezel Sold Separately (Click here to buy) CTM Part Number: 40005A
Fits Dometic / Marine Air Elite 2 Display, Part Numbers: 222000234 / 222000244
8-Pin display cable. This display cable is 8-conductor, shielded cable with reversed RJ-45 modular plugs on each end. This cable is compatible with all Micro-Air cabin and chiller controls. Select 6 ft to 75 ft. Compatible with Dometic 8-Pin Controls.
Part Number: SUB-031
SMXir display / keypad. OEM control display for Cruisair ®, Dometic ® and Micro Air, SMXir keypad. Smart, condensed housing with easy surface-mount installation. The large, easy-to-read LED displays cabin temperature, set point, programming prompts, and fault code warnings, and small LEDs and backlit text indicate system status. Compatible with legacy A-281, A-282 (SMX Online), and A-288 (SMXII) power/logic boards. Questions? Contact us. New control. Part Number: SMX IR / 502-09
This display cable is 6-conductor, shielded cable with reversed RJ-12 modular plugs on each end. It is compatible with Boards A-281, A-288, U-Boards, MAQ, equivalent OEM control boards, EasyTouch 6-pin, and equivalent OEM control display. This cable replaces the Dometic CXP Cable.
Part Number: SUB - CXP
NEW Temperature Sensor TSEP, RJ11, From 5 to 80 feet . 90-day warranty*. Probe temperature Sensor for Marine Air Conditioning systems. Compatible with Dometic, Marine Air, Cruise Air, Webasto, and any other Self-Contain or Split Gas unit that uses RJ11 connector (Phone Jack connector). Perfect Dometic Temperature Sensor replacement. Does not work with chiller units. 6-Pin Cable. Reference: TSEP
SMX II AB NEW OEM Keypad Display - ASY-423-X00 . Brand New. Fits Cruisair / Dometic SMX II AB keypad display. Completely new designed and manufactured board. Fully compatible with original Cruisair/Dometic power (logic) boards. For Self-Contained and Split Gas Units . For the chiller system SMX II keypad, see here . Questions? Contact us.
A/C Premium Installation Kit (Pump, Plastic Grills, Duct and Hardware) for Dometic ECD10, DTU10, and DTU12 and CTM CT-10 & CT-12 and Webasto Marine A/C Units. Part Number: 218000110-1
A/C Deluxe Installation Kit (Pump, Plastic Grills, Duct and Hardware) for Dometic ECD10, DTU10, and DTU12 Marine A/C Units. Part Number: 218000110-1D 4-6 WEEKS LEAD TIME FOR TEAK GRILLS
The Micro Air Easy Start 364 ASY-364-X20-IP is one of the most advanced and effective soft starters for all AC applications. It uses a 4-part start ramp sequence that is self-optimizing, resulting in the lowest possible start-up current. This delivers a 65-75% start current reduction compared to a compressor's LRA (locked-rotor amperage). The Easy Start also has numerous specialized fault checks not found in any other soft starter providing even further protection for your compressor. Fits Dometic, Marine Air, Cruisair, Webasto, CTM, Flagship and most marine AC Brands. 2 Year Warranty*
DISCONTINUED - CLICK FOR REPLACEMENT
CTM - PM500L is a completely submersible sealless centrifugal magnetic drive marine air conditioning pump ; also a Completely run dry pump. The model generates a maximum flow of 8.5 gallons per minute and, furthermore, a maximum head of 19 feet at 25 PSI. The PM500-115V is also ISO 8846 Marine Ignition Protected. 500 gallons/hr. Replaces March LC-3CP-MD and Dometic PML500 115V (336183)
MARCH PUMP MA LC-2CP-MD is an American submersible seal-less centrifugal magnetic drive pump. 115V - 50/60 Hz - 5GPM (300 GPH) It might be used submerged or not submerged. 3/8" FPT and 3/4" MPT Inlet, 1/4" MPT Outlet. Commonly used for marine air conditioning and fountains. March Pump Part Number: LC-2CP-MD Replaces Dometic Part Number: 225500004 / 334050 - PML250 115V
Double lamination of tough polyester, which encapsulates a steel wire helix, forms air-tight inner core. Seamless black polyethylene vapor barrier surrounds thick blanket of fiberglass insulation. R value 4.2 and meets or exceeds UL-181, NFPA 90A and 90B standards. Resistant to ozone, UV, and corrosion. For Class 1 Heating and AC Duct applications. Operating temperature -20°F to 250°F (-29°C -121°C). Please Select from 4" to 9" Internal Diameter
MPI 163 Series Marine AC Water Hose Extra Heavy duty construction with white PVC cover and black PVC inner tube. ID: 5/8" - OD: .895" - 450 psi - 50 ft. This marine Air conditioning water hose works with all A/C Units that have a 5/8" Seawater Inlet Connection. 90-day warranty*.
Part Number: 163-0586 / 1022510G-50
CTM Air Conditioner Filter for 10,000 - 12,000 BTUs unit. This filter might be compatible with other brands' self-contained units if the dimensions fit. Direct replacement for air filter on the CTM CT-10 and CT-12 Units. Dimensions of filter: 8.5" x 9.5" (WxH) Part Number: 40012F
CTM SMX II Wall Cover Plate for SMXir, Elite II, Qht, Passport & Easy Touch controllers. The plate is reversible, so both can be used, dark grey or black. Dimensions of the Wall Cover: 4.8 x 8.5 x 0.09 inch - 124mm x 217mm x 2.5mm (WxHxD)
CTM Compressor for Marine Self-Contained and Split Units. Works with units from 12,000 BTU's - 115V - 50/60 Hz - R410A. It is fully compatible with CTM, Dometic, Cruisair, and Marine Air Units (CT, DTU, STX, STQ, SXR, VTD, VCP, VRP) units. 90-day warranty. Note: This product is non-returnable and final sale, if you have any questions please contact our customer support team before purchase. Part Number: 40011K / EA82G0C-1BZDU1
CTM Blower assembly for Marine Self-Contained air conditioning units. Works with units from 10,000 to 12,000 BTU's - 115V. It is fully compatible with CTM, Dometic, Cruisair, and Marine Air (CT, DTU, STX, STQ, SXR, VTD, VCP, VRP) units. 90-day warranty. Part Number: 40013B
Protect your investment, avoid unexpected repair costs, and enjoy complete peace of mind with the CTM Extended Warranty.
Add 1 extra year of full parts on top of the standard warranty.
Must be purchased within 30 days of your unit purchase.
Only Valid for CTM Self Contained Units.
$157.89
$157.89
Reviews
MT
By Michael Thomas
2026-06-09 18:46:05
AC
Outstanding product, performance is great with no issue as so far
W
By Woody
2026-05-19 12:25:46
CTM 12 115v
The best 12k unit on the market. The U circuit board is the best, supports a lot of the existing touch pads.
BS
By Bob Spilar
2025-11-23 02:19:37
Warranty
Super Easy to get a replacement unit....
TK
By THOMAS KAMMERER
2025-11-04 21:30:52
Good purchase!
Good price. Good product. Good service. Quick delivery.
Work great!
Thx!
J
By James
2025-08-08 15:01:56
Direct replacement for Dometic DTU 12000
As promised, this was a direct replacement for the DTU turbo unit I replaced. The drain fitting is in a different location, so I had to splice in a piece of hose to reach it. It works well and seems to be a little quieter than the old unit. The refrigerant leaked out after one year, but Citimarine replaced it immediately with no hassle. The replacement unit is cooling great during the hot summer we are having.
GK
By Greg K
2025-06-18 17:10:31
Excellent plug and play Air Conditioner
Bought this to replace my old Cruise Air AC in my 2008 Sea Ray 330DA and so far so good. This AC is much quieter and seems to blow more air than the original. Fit in basically the same footprint as the old AC and uses my existing 8-pin control panel.
K
By Kent
2025-01-21 15:13:18
Works like a champ
Purchased nearly three years ago and run throughout the season down in south Texas on the gulf with no issues. Not going back to Dometic…
H
By Henk
2025-01-06 17:12:08
An easy replacement for older unit
Had an older unit that used the SMX-II thermostat/control unit. This unit has multiple display connectivity options (also supports the Pasport I/O). So didn't have to run any new cables or drill new holes and get used to a new control panel.
Other than that, it also works as expected. No complaints, I'm happy with the unit.
SS
By Stuart Smith
2024-12-17 03:46:16
CT-12 Review
Good unit. Interfaced with my Cruisair digital controls easily with a single cable. Quiet&efficient and a great value. Installed DIY
JW
By James Warren
2024-11-28 23:31:38
Direct replacement for Dometic DTU 12000
This was a direct replacement for the existing Dometic DTU 12000 unit that failed after only 5 years. This is an easy do-it-yourself project, only required some rerouting of the fresh water hose. It connected the the existing MarineAir thermostat. CTM unit is quiet and cools and heats like it should.
AM
By Anthony M Carpenter
2024-11-21 18:48:40
Great
Great unit and keeps salon very cool when hot outside.
LG
By lee graves
2024-10-23 18:30:59
Captain
The unit design is executed well with quality materials.
the fan is quiet ,current draw is as advertised and no tube rub is visible the unit should last for years
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