ShowerMate M-550 – Marine Tankless Water Heater

ShowerMate M-550

The ShowerMate M-550 is perfect for the boater who doesn’t want to leave the comforts of home behind when on the high seas.

$1,325 – Prefinished Aluminum
$1,525 – Stainless Steel (M-550S)

Buy PrecisionTemp RV-550 or RV-500

Hot Water in Any Season

The PrecisionTemp ShowerMate M-550 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 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 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.

    • Never run out of hot water again!
    • 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
How it Works

Type: 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.
Hook-ups: 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.

Capacity: 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: Side-mounted keyed bracket. Left or right side mounted.
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′).
Construction: 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.

Case and flue assembly are stainless steel.

Fuel: Propane at 11 WCI
Power: Burner: 12 element high primary air, atmospheric type with stainless steel flame strips.Aluminum manifold with brass pressure tap.

Orifices: Brass # 71 x 12.Gas Valve: Redundant solenoid with integral regulator

Water Temperature: Infinitely adjustable
Mounting flanges included. Must be mounted in accordance with any applicable Coast Guard and ABYC recommendations.
Safety Features: The Shower-Mate 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.REV. 6/07

For a period of One Year from the date of purchase, all parts of the Product are warranted to be free from defects in materials or workmanship. Defective parts will be repaired or replaced at the manufacturer’s sole discretion, free of charge for labor and parts. For a period of Three Years from the date of the original purchase, the burner and the heat exchanger of the M-550 is warranted to be free from defects in materials or workmanship. Defective parts will be repaired or replaced at the manufacturer’s sole discretion. Replacement will be pro-rated after the first year (call the factory for details).

Click to view the complete ShowerMate M-550 warranty terms