Marquis Heater Manifold 740-0614

Marquis Spas MS-740-0614 | 4.0kW Lezur Heater Assembly

The MS-740-0614 is the factory-standard replacement for the aging heaters found in the Marquis Sport, Mirage, and Spirit series. It is a robust, high-reliability unit built to withstand the unique water flow patterns of Marquis plumbing. Unlike "sensor-only" heaters, this unit provides mechanical flow verification through a pre-installed pressure switch, ensuring the heater only activates when the pump is moving sufficient water.

Key Features

• Integrated Pressure Switch: Comes factory-equipped with a calibrated pressure switch (usually a Tecmark 3902), providing mechanical fail-safe protection.

• Marquis "Lezur" Compatibility: A direct bolt-in for Lezur, Simplex, and Lite Leader systems found in 2000–2003 Marquis Spa models.

• 4.0kW Efficient Heating: Delivers 4.0kW at 240V or 1.0kW at 120V, perfectly balanced for mid-sized portable spas.

• Universal 15-Inch Housing: The standard 15" x 2" stainless steel tube makes it a straightforward replacement for original Balboa 58009 or 58081 assemblies.

• Incoloy 825 Element: Features a high-grade Incoloy element specifically chosen for its durability against the heavy chemical usage typical in smaller residential hot tubs.

Technical Specifications

Compatibility Note

This heater is found in a wide range of Marquis Spas models, including:

• 2000: Destiny RS, Reward RS, Quest RS, Spirit LS/LX, Oasis LS/LX, Mirage LS/LX, Sport Series (300, 500, 700).

• 2001: Sport 500, 600, 700.

• 2002–2003: Wish LS, Mirage LS, Spirit LS, Oasis LS.

Pro Tip: If you are getting a "FLO" message on your topside panel, it is often due to the pressure switch on this heater failing. Since this assembly includes the switch pre-installed, it usually solves both the heating failure and the error code in one go.

What's in the Box?

• 15" Stainless Steel Heater Tube

• 4.0kW Incoloy Element

• Pre-installed Pressure Switch

• Two 2" Split Nut Unions

• Two 2" Tailpieces and Gaskets