Marquis Heater Manifold 740-0617

Marquis Spas MS-740-0617 | 5.5kW High-Output Heater

The MS-740-0617 is designed for Marquis systems using the Lezur or Lite Leader control packs from the early 2000s. It features a mechanical pressure switch for flow detection, which was the standard before the industry transitioned to digital sensors. This assembly is a robust "drop-in" solution that restores the original heating speed of your premium Marquis spa.

Key Features

• 5.5kW Rapid Heating: Designed for 240V systems, providing the maximum allowable heating power for residential spas to ensure quick temperature recovery.

• Factory-Installed Pressure Switch: Includes a pre-calibrated Tecmark 3902 pressure switch, eliminating the need for separate installation or calibration.

• Marquis Premium Compatibility: Direct replacement for heaters found in the Marquis Epic, Show, Reward, and Destiny models (circa 2000–2005).

• High-Grade Element: Uses a premium Incoloy heating element designed to handle the high flow rates of Marquis's "Big Pump" configurations.

• Standard 15-Inch Footprint: Fits perfectly into the original plumbing unions without the need for pipe cutting or modification.

Technical Specifications

Compatibility & Troubleshooting

This heater is a direct replacement for various Marquis part numbers, including 740-0617 and 58083-01.

Technician's Insight: If your Marquis spa is displaying a "DR" (Dry) or "FLO" error code, the pressure switch on this assembly is the likely culprit. Because this unit comes with a brand-new, factory-set pressure switch, it is often the most cost-effective way to fix both a "no heat" situation and a flow-related error code simultaneously.

What's in the Box?

• 15" Stainless Steel Heater Manifold

• 5.5kW Incoloy Element (Pre-installed)

• Pre-wired Pressure Switch

• Two 2" Split Nut Unions

• Two 2" High-Temp Gaskets