Pentair Mastertemp / Waterco Turbotemp Gas Heater REPAIRS AND Services

Pentair Mastertemp

Sta-Rite Max-E-Therm

Pentair Mastertemp


 Pentair Mastertemp gas heaters are identical to Waterco Turbotemp and StaRite Max E Therm heaters. Our biggest concern is when the manifold leaks, it can fill the entire combustion chamber with water. This often destroys the heater.  Also the mild steel manifold bolts can easily be too rusty to remove.  

We only recommend these heaters where nothing else will fit.  We are a factory-trained Pentair repairer.

Combustion  Style:

Fan-forced downward, column flame.

Header Manifolds:

Noryl, multi-gasket, against mild-steel plate. 

Heat Exchanger:

Copper / Cupro-nickel 

Models: Natural Gas or LPG   

Mastertemp 125 - Output : ~29kW     

Mastertemp 200 - Output : ~46kW     

Mastertemp 300 - Output : ~69kW     

Mastertemp 400  - Output : ~92kW   

Waterco Turbotemp

Sta-Rite Max-E-Therm

Pentair Mastertemp


Waterco Turbotemps were simply a re-branded Pentair Mastertemp. Waterco has moved on from these heaters. Waterco now recommends a different brand of heater.
Models: Turbotemp 125, 200, 300, 400

Sta-Rite Max-E-Therm

Sta-Rite Max-E-Therm

About Pentair Heaters


Yet another re-branded Pentair Mastertemp, this time with a different outside casing. The internals are identical.
Models: Max-E-Therm 200, 300, 400

About Pentair Heaters

About Pentair Heaters

About Pentair Heaters


We carry almost all spare parts on-board, and were an Authorized Service Agent.   We only supply these heaters where space is a requirement, and handle all Warranties directly. We do not recommend Pentair Heaters for most installations.

More Information

About Pentair Heaters

More Information


They use a finely tuned fan-forced blower for efficiency. Unfortunately they succumb to any problem with water flow and gas supply pressure. Their Heat Exchangers appear to be more prone to issues with water chemistry. 

Pentair / Waterco / Sta-Rite Troubleshooting

Pentair Mastertemp Error Codes & Troubleshooting

Pentair Mastertemp, Waterco Turbotemp, Sta-Rite Max-E-Therm Gas Heater Error Codes:

Service System LED On - Heater not detecting water pressure. Make sure valves in correct position, filters clean, and sufficient water flow through heater.

Service Heater LED On - Cycle Mains power off, then on. Try again. If fault reoccurs, see below.

Other Codes that may be seen:

AGS - Gas Shutoff. Temperature in heater is too high.  Call for Service.

HLS - Hi Limit Switch Opened - Call for Service.

PS - Pressure Switch Opened. Clean filters and ensure correct water flow. If this reoccurs, Call for Service.

AFS - Air Flow Switch Failure. Do no operate heater. Call for Service.

SFS - Stack Flue Sensor Error. Combustion may be incorrect.  Call for Service.

E01 - Temp Sensor Failed. Water chemistry may be incorrect. Call for Service.

E02 - High Limit Sensor Failure.  Ensure water flow is correct. If this reoccurs, Call for Service.

E03 - Thermal Fuse Failure. Temperature exceeded limits. Do not operate heater.  Call for Service.

E04 - Fan Sensor Failure.  Sensor error or blocked / sooted heat exchanger. May be bad gas supply or failed parts. Do not operate heater. Call for Service.

E05 - Stack Flue Sensor Failure.  Sensor error or blocked / sooted heat exchanger. May be bad gas supply or failed parts. Do not operate heater. Call for Service.

Other Issues That Require Service:

Loud, high-pitched whine - Flame is too rich. Call for Service.

Flame is “fluttery.” Flame is too lean. Exhaust may have acrid smell or burner may fail

to stay lit. Call for Service.

Burner pulsates or Exhaust vent is too long. Reduce length of exhaust vent and/or surges, especially on number of elbows. Call for Service.

Boiling in heat exchanger - Low water flow to heater, pump and or filter. May be accompanied by water “bumping” sounds. Do not use heater. Call for Service.

R13 / R8 - Part of Startup Sequence. Wait for next step. 

Smoke or Steam coming from heater. Switch heater off, and gas valve off. Do not use heater. Call for Service.

Frozen Screen - Heater may have restarted too many times. May be gas supply issue. Call for Service.

If any of the above continue, please Contact us for Service