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CTM CT-16 Marine Air Conditioner 16,000 BTU - 115V - 50/60HZ

50/60 HzDual Frequency Cooling or HeatingReverse Cycle Titanium (Ti) CoilsAnti-Corrosive 2-YearWarranty


Reference: 24101C
Add Elite II Control with 8-Pin Cable (10 ft) - $195.00

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CTM Marine CT-16 - 16,000 BTU Marine Air Conditioner - 115V - 50/60HZ - Turbo Blower

16,000 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. 2 Year Warranty*. Patent number.: US 12,030,610 B2.

The quiet, powerful, and efficient CTM is a great option for new installs but also works as the perfect drop-in replacement for all major marine A/C brands including Dometic, Webasto, Cruisair, Marine Air, and Mermaid Air. This CTM 16,000 BTU marine air conditioner is fully compatible with all Dometic, Cruisair, Marine Air, and Micro Air controls/thermostats and cables, making replacement of those systems a breeze.

16000 BTU marine air conditioner

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 self-contained marine air conditioner that raises the bar on quality and performance.

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 2-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


CT Unit Dimensions
16,000 BTU
100-120 V
50-60 Hz
Refrigerant Type
Starting Amps
29.25 A / 12 A (w/EasyStart)
Current Consumption Cool / Heat 
10.3 A / 13.5 A
Locked Rotor Amps
60 A
Fuse Max. / Min.
40 A / 25 A
Blower Airflow
453 CFM
Blower Speed
1400 RPM
High Velocity Blower
Min. Supply Duct Size
6 / 152 (in/mm)
Seawater Inlet Connection 
5/8" / 16 (in/mm)
Suggested Water Flow
500 GPH
Net Weight 
59 lbs / 27 kg


Features of the CTM CT-16
Dometic 16000 Btu Marine Air Conditioner Replacement

   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.
Electrical-Box.jpg   Electrical Box
Rugged electrical box with fire retardant cover.
   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. 
   Stainless Steel Frame Base
Corrosion-resistant stainless steel frame base will not rust or fall apart. Long-lasting and made to withstand the harsh marine environment. 
   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.
Very quiet yet powerful marine air conditioning unit, making it a great option for powerboats and sailboats. 
HV Blower.png   Rotatable 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.
   Digital Touch Control
The CT is compatible with the CTM Touch display - a 2.5" Color Display with the latest technology in the industry, including numerous programmable parameters, operational features, and much more.


16000 btu marine AC
A - Width
20 in / 508 mm
B - Drain Pan Width
10 in / 254 mm
C - Height
14 in / 356 mm
D - Depth
13.5 in / 343 mm
E - Min. Duct Diameter
6 in / 152 mm

CTM CT Unit Cooling Efficient Design vs Competitors

CTM CT untis cooling benefit.jpg
niversal Control Board Layout

Compatible with Most Thermostats

CTM Elite II Control.jpg
Smart Touch / Easy Touch CTM Elite II  Passport I/O SMXir

Because the CTM unit comes with the Universal Control board, it should work with the controller you currently have. Supported controllers include the SMXirPassport I/OSmart 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 Conditioning
CTM Marine Air Conditioners - All New, Superior Marine Air Conditioning

CTM Marine Air Conditioners not only improve on the efficiency and performance of other top units on the market, but are more durable, longer-lasting A/C units, 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.

Read More
Best marine air conditioning unit
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. 

To be honest, most marine air conditioners from all the major brands are solid and will do the 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.

Read More

Notes if replacing a Dometic DTU16, DTG16 or ECD16 - 115V

The CTM CT-16 16,000 BTU marine air conditioner works well as a replacement for the Dometic DTG16 - 115V (205160174), DTU16 - 115V (205160160), or ECD16 - 115V (207500316). There are some specs that should be taken into consideration when replacing one of the units previously mentioned. 

- Because the CT-16 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-16 Unit has a 6-inch ducting ring whereas the Dometic comes with a 7 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.

Also Substitute the following Part Numbers

CTM Unit Part Number Description Fits OEM Part number  OEM Description
24101C CT-16 115V 50/60HZ 410A 205160174 DOMETIC DTG16 115V 50/60HZ 410A
205160160 DOMETIC DTU16 115V 60HZ 410A
205160161 DOMETIC DTU16 410A 7" MR 115V 60HZ
207500316 DOMETIC ECD16K/2-HV 410A 115V 50/60HZ
205561755 CRUISAIR STX16-410A 115V 60HZ ONLY
205561700 MARINE AIR VTD16K-410A 115V 60HZ ONLY
2510143A WEBASTO S16 BLUECOOL 16,000 BTUS 115V 60HZ

CT-16 Self Contained Marine A/C Product Review Video

Installation Video

Comparation video CTM vs Webasto vs Dometic


The warranty period of registered CTM products is (2) two years, being the first year parts and labor, the second 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.

CTM Logo


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Better Than "Marine Air" Original
On the failure of our Marin Air (Dometic) 12,000 BTU A/C, we researched Citimarine's' excellent comparison video and chose the CTM-16 at 16,000BTU, which promised to fit the same limited space. Superior construction, separate well-designed terminal box, easy to understand instructions and Citimarine-sponsored video instructions, the installation would have taken me, a novice, 3 hours to install, very easy, but needing various customizing parts (wire extension, drain lines, screws etc) took me 8 hours. Still, very satisfied to have saved $1,000 over local pro's installation with local tax. Drawbacks: 2 drains on the same side - better to offer one on each side. Don't believe UPS 2-day delivery. Receptionist, Anna is the best! Best pluses: quieter and 25% more power. Icy interior with 90 degrees outside.
Absolutely PERFECT
I have a 2009 Sea Ray 350 Sundancer, and I bought this to replace my dead Dometic unit. I ordered it in October 2022, and it arrived days later. I installed it about a week later. I COULD NOT BE HAPPIER. The installation was tough at first, as Sea Ray makes you take down a wall and some more stuff just to get to the air conditioner in my particular boat. However, once I got to the old unit, the installation was easy. The controls looked the same so swapping one wire to the new unit was a breeze. I didn't need to replace anything else. I've had this unit running for almost 6 months now (4 of them it was winterized), and it works perfectly. Actually, it works better than I expected. It's quieter than I thought it would be, and chills my space in no time. The only thing I noticed was the previous Dometic had 5 speeds, and this one has only 3. NOT A BIG DEAL! Also, did I mention the price? I shopped for weeks looking for a well-built, comparable HVAC unit. This is the only one that met and beat my dead unit. The size is similar, it's a little lighter in weight, the price is much lower, the installation is a breeze (once you get it side by side, and the quality is top notch. Thank you CTM for making a quality unit, and standing behind your product.
Great Replacement for a 2013 VTD-16K.
I am happy with this unit as a replacement for a Marine Air Systems by Dometic VTD-16K 410A. The raw water connection are on the other side from the VTD16K. I spliced on some additional hose to make it work. I'll rerun the hoses as one continuous hose when I get a chance. The wiring was pretty straightforward. The electrical terminals are in different order than the VTD16K--just pay attention. I had a custom distribution box on my VTD16K that was easily transferable to the CTM CT-16. The CT-16 6-inch round hose adapter easily came off revealing an alternate bolt pattern exactly the same as the VTD16K. It runs quieter than expected even without the sounds shield I had on my VTD16.
CTM Self contained A/Cunits
Just ordered and installed the 16k and 10k to replace my 2006 Dometics. I read the info on the Citimarine website and spoke several times with JP. The articles and comparisons article made the choice easy The CTM ynits are indeed plug n play and I upgraded to the Elite II displays. The units are quiet and smaller footprint than before. Citimarine answered my questions quickly and even referred me to a local service company that installs these units. Install is doable for anyone who is mechanically inclined. Not hard at all. Happy customer.
The unit is working excellent so far. What we like the most is that this one cools the cabin to the real time set, for example if it is set to 65 degrees the cabin’s temperature goes to that exact temperature. The old unit we replaced ( Dometic ) never cooled the cabin to 65 degrees even though it was set to that temperature, if we put it to 65 degrees, the cabin was always 68 degrees, Another thing is that the CTM is more quiet, silent.
Great, quiet, heat and cool like we never had
The boat we have is a 2004. It had Cruisairs that did not hold refrigerant any longer. One had been repaired, but leaked again. The quote given to me was nearly 9k to replace. I did some investigating, found the CTM units and how to install. I just put them in 2 days after Xmas myself. The boat is in Ft Myers Beach, I live in Wisconsin. I ordered them 3 weeks ahead, figuring it would take time. Ordered on a Friday, delivered to the marine the next day. They run great, quiet, heat and cool like we never had. Thank you very much, saved me about $4800
My Dometic DTU16 kicked the bucket this year. Replaced it with the CT16. Great price, and the sales guys were real knowledgeable, helpful. The CT unit kept my boat cool all summer, worked like a champ. Will be testing out the reverse cycle soon.
Great Unit
I bought this unit as a replacement for my cruisair VTD 16, and I am very pleased with my selection. Great unit and lets me use my old thermostat and cable.