Balboa 3kw M7 Heater - 58118 (Plastic Box Fit)

Balboa 3kw M7 Heater  - 58118 (Plastic Box Fit)

Official high-quality replacement 3.0kW Balboa spa heater with M7 sensors used specifically on hot tubs and spas. This particular 3kw M7 model has the shorter 12-inch sensors and has two studs on the heater tube which is used to secure into all Balboa plastic boxed M7 GS & GL spa control boxes.

The following items are included with this complete Balboa 58118 spa heater assembly:

• 2x 2-inch heater gaskets
• 2x studs with 3/8" mounting nuts
• 2x Balboa 12-inch M7 sensors
• 2x 2-inch plumbing union tailpieces

Balboa Heater Overview

• Heater can be fitted only to plastic control boxes, Balboa GS500Z, GS501Z, GS510SZ, GS501SZ, GS510DZ, GS520DZ, GS523DZ, GL2000 & GL2001.
• Patented Balboa M7 sensors, one at each end of the heater used to monitor temperature and flow rate within the heater tube.
• Found on 80% of spas here in Europe, spas from brands such as Viking Spas, Cove Spas, Spaform, Hydropool, Beachcomber, Hydrospa, Aegean, Master Spas, Catalina, Canadian Spa, Danz, Clear Water, Villeroy, Passion Spas, Fonteyn, Marquis Spas, Strong Spas, Spacrest and many others.

Balboa Heater Specifications

• Manufacturer - Balboa Water Group
• Part Number - 58118 (replaces many other part numbers)
• Type of Product - Spa or Hot Tub heater assembly
• Kilowatt Rating - 3.0kW
• Element Material - Incoloy 800
• Flow Detection - 2x 12" M7 sensors
• Sensor Type - M7 Sensors
• Plumbing Union Size - 2 inches (78mm thread OD)
• Pipework Connection Size - 2 Inch female socket (60mm ID)
• Length: 380mm,
• Length Inc Union Tails: 495mm, 
• Diameter: 60mm
• Distance of Terminals: 31.75mm

Heater Fitting & Removal Guide

This M7 Balboa heater is mounted within the bottom of the spa control box, you can remove this heater without the removal of the control box. Do this by undoing the two large plumbing union collars first and if needed unscrew the two screws from the split heater collars and remove them completely to give you more space. Disconnect the two copper power terminal straps by removing the two 3/8" nuts and gently bend up the copper straps away from the terminals. The heater tube itself is held into the plastic control box by two 3/8" nuts, one above and one below the centre of the heater tube. Loosen the nuts and unplug the two M7 sensors from the printed circuit board by pushing the small tab in and unclipping from the PCB. Remove the heater from the control box and reinstall in the same order.

Take care when tightening the two heater power wires onto the new heater terminals, use a 1/4 inch spanner and hold the base of the terminal whilst tightening the 3/8 inch nuts up to prevent the terminals being twisted. New gaskets are supplied with the new heater so replace and fit these to your heater union connections. 

We Are Here To Help!

It can be a bit confusing choosing your new spa heater as brand names and models are not always written on them. The quickest way is to simply send us some images of the complete spa heater assembly you need the replacement for through our Contact us page and let us do the work for you.