PrecisionTemp ShowerMate M-550 EC (Marine Applications)

M-550 EC SM
$1 385.00
In stock
Product Details
The ShowerMate M-550 EC is perfect for the boater who doesn't want to leave the comforts of home behind when on the high seas.
  • Endless hot water, on-demand
  • Designed specifically for the marine environment
  • Needs no engine or shore power
  • Mounts almost anywhere with standard power vent
  • No pilot light and very high efficiency
  • Straightforward installation
  • Reliable, proven VariFlame technology control system
Hot Water in Any Season

The PrecisionTemp ShowerMate M-550 EC tankless, marine water heater utilizes our patented VariFlame Control technology to deliver an endless flow of hot water for the ultimate marine shower.

The heater operates only when the hot water outlet is turned on. The VariFlame control system then keeps the water temperature constant regardless of the flow rate or incoming water temperature.

The Proof is in the POWER

With 55,000 BTUs—the highest hot water output in the industry—and built-in freeze protection, the M-550 EC delivers on-demand, continuous hot water—all without using engine or shore power.

Quiet and Efficient

For the same amount of propane, the M-550 EC produces more hot water than a traditional water heater.

Many people find that they use up to 50% less propane, with lower operating costs and fewer fill-ups. It’s lightweight, compact, efficient and installs almost anywhere.



Gas instantaneous, power vented. Full gas modulation temperature control.

Dimensions:13.5″ Wide x 13.5″ Deep x 14.5″ High, including power vent.

Weight:30.5 pounds full


Electric: 18-2 x 2′ lead. Gas: Brass 3/8″ flare inside case, rear accessible.
Water: 1/2″ OD copper tubing.
Brass compression to 1/2″ NPT elbow can be installed or as specified.


55,000 BTU input – 44,000 BTU output at maximum burn at 8.5 WCI manifold pressure.15,000 BTU input – 10,600 BTU output at low burn at 1.2 WCI manifold pressure.
(88°F temperature rise per gallon per minute continuous flow at high burn).

Fuel Consumption:2.55 lbs per hour at maximum input. (At 2 GPM of water, 20 lbs of propane will produce over 940 gallons of hot water).

Mounting:Floor mounted flanges (included)

Clearances:Zero clearance top (blower), bottom and sides. 2″ in back for hook-ups. Enough space in front to remove cover for service.Venting:2” power vent with proofing switch. (2” stainless flex duct recommended to the outside, and can run up to 15′).

Modular: Three assemblies; gas, electronics and water. Burner: High primary air, 12 element, atmospheric type.
Aluminized steel body with stainless flame strips.
Heat exchanger: Copper fin tube type with wrap for cooling.
Electronics: Plug in, potted, works-in-a-drawer.
Burner and flue assembly are stainless steel.

Fuel:Propane at 11 WCIPower:

Burner: 12 element high primary air, atmospheric type with stainless steel construction.
Orifices: Brass # 71 x 12.Gas Valve: Redundant solenoid with integral regulator.

Water Temperature:Adjustable

Mounting flanges included. Must be mounted in accordance with any applicable Coast Guard and ABYC recommendations.Safety Features:

The ShowerMate is pilotless. There is no flame unless water flow is sensed.Flame rectification: Gas valve shuts off in .8 of a second if there is a flame outage.
Redundant gas solenoid.
Electronic high temperature shut-off (2).
ECO high temperature shut off @ 165°F with manual reset.Pressure relief valve at 100 PSI.
Power vent must proof fluing before gas valve opens.

Due to continuous product improvement, PrecisionTemp reserves the right to change specifications at any time.

AffordableMiniSplits is an Authorized PrecisionTemp Dealer.

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