Dometic EnviroComfort ECD16K-HV AC Retrofit Kit 115V 16K BTU

The Dometic EnviroComfort ECD16K-HV is the 16,000 BTU reverse-cycle marine air conditioner that's designed as a clean retrofit for older self-contained units. If you've got an aging 12,000 to 16,000 BTU AC sitting in a cabinet on your sailboat, trawler, or express cruiser, this is the kit that goes in its place without a major install rebuild. You get cooling for the summer, heating for the shoulder seasons, and the digital control that finally lets you set a temperature and have the unit hold it.

Reverse-cycle is the right system for most boaters who use the boat in more than one season. The same compressor and refrigerant loop that pulls heat out of the cabin in July can run backwards and pump heat into the cabin in October. It's not a miracle in a 35 degree night, but in the 50s and 60s it'll keep a sleeping cabin comfortable without firing up a furnace or a generator-hog electric heater. R-410A refrigerant is current, environmentally compliant, and runs at higher pressure than the older R-22 systems for better heat-pump performance in cooler weather.

The high-velocity blower is the design choice that makes this unit fit where older big-box AC units didn't. The motor is internal to the blower housing instead of bolted on the side, which shrinks the overall footprint and gives you more usable cabinet space around the unit. The blower itself rotates so you can mount it horizontal or vertical depending on what your duct run wants to do. That alone solves a lot of retrofit headaches on older boats where the original unit was awkwardly oriented.

The drain pan is stainless steel, which matters more than people realize. Marine AC condensate is wet, mildly corrosive, and runs constantly when the unit is on. A galvanized or plastic pan eventually crystallizes, weeps, and stains the bilge. Stainless just keeps working. The drain port is plumbed for easy connection to your existing drain hose. The return-air filter is preinstalled and pulls out for rinsing in the sink, which is the kind of maintenance you'll actually do, instead of a filter that needs three tools and a haircut to access.

Electrical. The unit runs on 115V AC at 50 or 60 Hz, with a peak starting current of 62 amps and steady-state operation that fits inside a 25 to 40 amp breaker. That start surge matters. Make sure the power feed is sized right and the breaker is rated for the surge, not just the running load. Undersized boat wire is the single most common reason owners report compressor trips on long runs from the panel. If your existing run is more than 25 feet on 14 AWG, upgrade to 12 AWG. If it's longer than 40 feet, plan on 10 AWG. Voltage drop kills compressors.

Seawater. The condenser uses raw seawater for cooling, with a 5/8 inch inlet connection. You'll plumb that to your existing seacock and pump if you're retrofitting. The original strainer, pump, and through-hull are typically reusable assuming they're in good shape and sized for 16K BTU flow. If you're upgrading from a 12K BTU unit, double-check that your pump can deliver enough flow for the larger condenser. Dometic publishes the flow specs in the install manual and they're worth following.

Ducting. Minimum supply duct size is 6 inches. Most retrofit installs reuse the existing ductwork, which is fine if it was sized correctly originally. If you find airflow restrictions or icing on the evaporator coil in humid climates, the ducting is usually the culprit. Bigger duct, fewer 90 degree bends, and properly sealed connections solve almost every airflow complaint we see.

The Dometic Passport I/O digital control comes in the box with a 15-foot cable. Mount it where you can see it from the bunk, set your temperature, and forget about it. The control handles cool, heat, fan-only, and auto modes with a clean LCD readout. The plastic remote electrical box mounts wherever it makes sense for your wire runs and gives you a tidy junction point for the high-current connections.

What's in the box. The self-contained ECD16K-HV unit, the Passport I/O digital control with bezel and 15-foot cable, the plastic remote electrical box, and the installation manual. That's the kit. You'll provide the seawater hoses, ducting, and electrical feed.

One important note. This unit is non-returnable to NVN Marine. Marine AC units are commissioned during install and can't be resold once they've been pressurized into a boat's seawater and electrical systems. Any warranty issues run directly through Dometic's authorized service network, which is broad in the U.S. and the Caribbean. We can help you connect with a service center if you need one.

If you're not sure whether your old unit is genuinely 12K to 16K BTU or something else, pull the data plate on the existing AC and confirm the BTU rating before ordering. Sizing matters, and the wrong-size retrofit either doesn't cool the cabin properly or short-cycles itself to early failure. When in doubt, call us before ordering.