Hydro-Quip 26-0011-7S-K Cal Spas Heater, FloThru, XL Repl, 15"x2", 230v , 5.5kW, w/Box, Gen

Balboa / HydroQuip OEM heater assembly

Core specifications

• Voltage: 240V

• Wattage: 5.5 kW

• Amperage draw: ~23 amps

• Heater tube length: 15 inches (center-to-center)

• Tube diameter: 2" stainless steel

• Ports: 2" slip (straight-through)

• Sensors:

  • Includes M7 dual sensors (in the “-7S-K” suffix)

  • Sensors are factory mounted in the heater tube

• Threading: Standard Balboa sensor wells (non-threaded M7)

This heater was factory-installed in thousands of spas using Balboa VS, GS, and early BP platforms.

Direct Drop-In Replacements (NO cutting, NO rewiring)

These heaters are 100% interchangeable with the 26-0011-7S-K:

✅ Balboa OEM

• 58118 – Current Balboa direct replacement

• 58083 – Older OEM equivalent (still compatible)

• 26-0011-7S – Same heater without retail kit packaging

• 26-0011-7S-K – Your original part number

✅ HydroQuip (OEM-grade)

• HQ 26-0011-7S

• HydroQuip 26-0011-7S-K

These are true OEM builds — same stainless tube, same sensor tolerances, same flow requirements.

Why the “-7S-K” Suffix Matters

• 7S = Dual M7 sensors included

• K = Retail kit (gaskets + hardware)

If you install a heater without M7 sensors into an M7 system, the spa will throw:

• SN / HL / DR / DY errors

• Or refuse to heat at all

Spas Commonly Using This Heater

(Partial list — there are many more)

• Master Spas (mid-2000s to early BP era)

• Cal Spas (Balboa-equipped models)

• Artesian (non-Proprietary years)

• Marquis (select models)

• Generic Balboa retrofits

Also replaces: