Solar-powered Air-to-Water air conditioning heat exchanger for Boat, Yacht, Waterfront home, Island home, or Solar Geothermal Home - no noisy generator or inefficient inverter!  In the past, comfort required staying tethered to shore power on the dock in a marina. But you purchased the boat to explore and enjoy peaceful, even exotic, remote anchorages. Then you discovered that meant running a large, noisy, diesel-hungry, expensive, high-maintenance generator 24/7 while cruising and at anchor, completely polluting the sounds of peaceful anchorage.

Imagine navigating by day in a comfortably air-conditioned/heated helm while recharging batteries and desalinating enough water for the evening. (See our 48v DC Direct Water-Maker.) After dropping anchor for the evening, you redirect that energy to cool down the salon and galley to a perfect temperature while preparing dinner, and enjoying cocktails with a movie without the background drum of a generator running. After the movie, you open the salon doors to let the evening air swirl through the salon while retiring to your quiet bug-free air-conditioned cabin for a restful night's sleep.

~Equivalent to 32 to 42 SEER! Our DC-Direct Chillers are ABSOLUTELY the MOST EFFICIENT solution available or manufactured anywhere worldwide!  Chillers with separate air handlers are well known to be the most efficient solution to heating and air conditioning. Our unique 48v / 24v DC-Direct Marine Air to Water Heat Exchangers utilize power from DC solar and DC battery sources without wasting 20% to 50% on 2 to 5 conversions before it reaches the unit, compared to AC-powered units.

Availability: First 8 units shipping ~Aug 15th!   Five 48V 16,000 BTU, two 24V 12,000 BTU, and one 9000 BTU are Order Now!  All available MADE to ORDER - 3 Months to Delivery. 50% minimum to order, 50% balance due when ready to ship.

How is this Dream Possible?

A marine water chiller functions like an open-loop geothermal heat exchanger.  Read Why is DC-Direct better?

1. The 48v DC 24,000 BTU Titanium Water Chiller is installed in the Yacht's engine room or bilge storage area. The chiller transfers heat from the internal water-glycol system to the exterior raw water for cooling or reversed for heating. A water-to-water heat exchanger is essentially two water pipes, isolated from each other,  transferring heat through a membrane without mixing, and circulation pumps. It's internally closed-loop, so not affected by the hot, humid air of the engine room or bilge.
2. Each space on your yacht (cabins, salon, indoor helm) that needs cooling or heating receives its own appropriately sized, very quiet air handler (essentially a radiator, fan, and thermostat/humidistat). This naturally zoned system makes it possible to only cool or heat one or more occupied cabins at night or only the salon or helm by day and not the entire boat!
3. A single insulated pipe originating at the water chiller, or an optional Thermal Energy Storage Buffer Tank is fed by a circulation pump and loops around the boat connecting each air handler in series and then terminating at the water chiller.
4. When the thermostat/humidistat of any of the air handlers turns on,  it turns on the circulation pump

Features

• Simplicity = Low maintenance! Turns off when the chilled water temperature difference between inlet & outlet reaches 41℉
• Titanium Heat Exchanger - much longer life over nibrol especially in saltwater environments
  
• The compact size and option of multiple units in parallel make installation in an already cramped engine room or bilge storage space easier.
• Infinitely Variable from 3,000 to 24,000 BTUs - internally contains two 12,000 BTU stages, each automatically and independently adjusting to available power and demand. Chiller operates on 1 compressor if the demand is less than 12,000BTU
• Plumb 2, 3, 4 or more in parallel for larger vessels that require 48,000 BTUs, 73,000 BTUs, or  96,000 BTUs or more.
• The noise and heat generated by the compressors is removed from the living space, improving efficiency and blissful silence.
• Brushless DC circulation pumps are smaller and naturally variable speed, with less internal resistance, so more efficient, and up to 10x longer lasting than brushed AC pumps.

Quality Components

• Titanium Condensing Coils
• Stainless Steel Plate-Type Heat Exchanger Evaporator
• Two 12,000 BTU 48v DC Rotary Compressors
• Thermal Expansion Valve
• R134a Refrigerant
• DC Controls - High / low-pressure switches, gauges, safety valves

Ultra-durable, high-efficiency marine air conditioner designed for yachts, offshore platforms, and vessels. Featuring 48V DC inverter technology, a titanium alloy condenser tube, and a corrosion-resistant stainless steel housing, this system delivers fast cooling, reliable heating, and energy-efficient performance. Built for harsh marine environments, it integrates WiFi remote control, low-noise operation, and intelligent electronic expansion valve technology for seamless climate management.

 

--------

A high-performance, energy-efficient marine air conditioner designed to meet the demanding cooling and heating requirements of offshore vessels, yachts, and marine platforms. Engineered with 48V DC inverter technology, this unit provides stable temperature regulation, fast cooling, and optimized energy savings, making it ideal for marine and offshore environments.

With a cooling capacity of 12000BTU and heating capacity of 13450BTU, the MAR-48V/12BP ensures superior climate control in both hot and cold conditions. It features a titanium alloy condenser tube heat exchanger, offering exceptional corrosion resistance against seawater exposure. The 304 stainless steel housing with electrophoretic anti-corrosion treatment further enhances its durability, allowing it to withstand the harshest marine conditions.

This unit is equipped with an IP68-rated waterproof centrifugal vortex outer rotor motor, ensuring low noise operation for a quiet and comfortable onboard experience. Additionally, its smart electronic expansion valve improves refrigerant flow efficiency, increasing cooling performance and system longevity.

For added convenience, the MAR-48V/12BP supports WiFi remote control, allowing users to monitor and adjust temperature settings effortlessly through a mobile application. With robust construction, intelligent control systems, and premium components, this marine-grade air conditioner guarantees long-lasting performance, rapid cooling, and maximum energy efficiency.

Features

• 48V DC Inverter Technology – Provides precise temperature control, reduces energy consumption, and extends compressor lifespan
• Titanium Alloy Condenser Tube Heat Exchanger – Offers exceptional resistance to seawater corrosion while enhancing heat exchange efficiency for faster cooling
• High Cooling and Heating Capacity – Delivers 12000BTU cooling and 13450BTU heating, ensuring optimal comfort in extreme conditions
• Corrosion-Resistant 304 Stainless Steel Housing – Ensures long-term durability in harsh saltwater environments with electrophoretic anti-corrosion coating
• IP68 Waterproof Centrifugal Vortex Outer Rotor Motor – Operates efficiently with minimal noise, providing a quiet and comfortable experience
• Smart Electronic Expansion Valve – Optimizes refrigerant flow to enhance cooling efficiency and reduce system wear
• WiFi Remote Control Capability – Allows users to adjust temperature, monitor performance, and change settings via a dedicated mobile app
• Energy-Efficient and Eco-Friendly Refrigerant – Utilizes R410A refrigerant, ensuring an environmentally friendly cooling solution
• Brushless Circulation Pump - 2400L/H for 16,000 BTU and 12,000 BTU, and 1900L/H for 9000 BTU

Power supply can be contacted for production: 110V/220V/230V/24V/48V（Both AC and DC can be produced）
Model number	MA-09C	DCR-48V/BP	ACR-220V/DP	ACR-220V/DP
COOLING CAPACITY	9000BTU	12000BTU	16000-18000BTU	24000-27000BTU
HEATING CAPACITY	10450BTU	13450BTU	17450BTU	25150BTU
POWER SUPPLY	AC-220V/1ph/50Hz	DC-48V/1ph/50Hz	AC-220V/1ph/50Hz	AC-220V/1ph/50Hz
RATED POWER INPUT	850W	1020W	1386W	2750W
RATED CURRENT	3.9A	21.25	6.3A	12.5A
MAX. POWER INPUT	950W	1227W	1587W	2958W
REFRIGERANT	R410A/420g	R410A/560g	R410A/670g	R410A/960g
Decibel of noise	42/52dB(A)	42/52dB(A)	42/55dB(A)	42/58dB(A)
AIR VOLUME	560m3/h	560m3/h	650m3/h	880m3/h
ANTI-SHOCK GRADE	I	I	I	I
WATER-PROOF GRADE	IPX4	IPX4	IPX4	IPX4
NET WEIGHT	28Kg	32Kg	36Kg	42Kg

Q&A

What are Inlet water temperature limits for Cooling and Heating?

When Cooling, inlet water temperature must be >68℉ (20°C). When heating, inlet water temp must be above freezing or >34℉ (2°C).  The minimum storage temperature for the closed loop circulation between air handlers and chiller is based on glycol/water mix used.

How to Heat when temperatures drop below freezing?

For heating below freezing, the exterior raw water circulation pump is left off. Instead a water heater (electric, diesel, LPG, or natural gas boiler) is used in the interior distribution loop. 

With this system, can I use waste heat off the engines or generator to heat the boat?

YES, you can use waste heat off your main propulsion or generator engines by adding a passive heat exchanger between the engine coolant and the interior distribution loop. With some creative plumbing (bypass valves), a portion of the propulsion engine coolant could be passed through the raw water intake of the chiller (unsupported, could void warranty).