Pentair Air Blower Kit for Mastertemp 400 77707-0253
Pentair
SKU: 77707-0253
Pentair MasterTemp & Max-E-Therm 400K Natural Gas Heater Air Blower Kit | 77707-0253
The Pentair 77707-0253 Combustion Air Blower Kit is a genuine OEM replacement assembly designed for compatible Pentair MasterTemp and Sta-Rite Max-E-Therm 400,000 BTU natural gas pool and spa heaters.
The combustion blower supplies the airflow required by the heater's gas burner system. It works with the heater's combustion controls to support proper ignition and operation.
Manufactured to Pentair's original equipment specifications, this replacement blower kit is designed for servicing compatible 400K BTU natural gas heaters with a failed or damaged original blower.
Product Features
- Genuine Pentair OEM: Original manufacturer combustion air blower replacement kit.
- 400,000 BTU Heater Compatibility: Designed for compatible 400K BTU natural gas heater models.
- MasterTemp Compatibility: Fits specified Pentair MasterTemp 400NA heaters.
- Max-E-Therm Compatibility: Fits specified Sta-Rite Max-E-Therm 400NA heaters.
- Combustion Air Supply: Provides airflow for the heater's gas burner system.
- Single-Voltage Blower Adapter: Includes the blower adapter specified for compatible Max-E-Therm applications.
- OEM Replacement: Designed to replace the original blower assembly requiring Pentair part number 77707-0253.
Product Specifications
- Manufacturer: Pentair
- Manufacturer Part Number: 77707-0253
- Distributor Part Number: STA-151-0253
- Product Type: Combustion Air Blower Kit
- Compatible Heater Series: MasterTemp / Max-E-Therm
- Heater Capacity: 400,000 BTU
- Fuel Type: Natural Gas
- Compatible MasterTemp Model: 400NA
- Compatible Max-E-Therm Model: 400NA
- Application: Pool and Spa Gas Heater Burner System
- Parts Diagram Reference: Item #5
- Distributor-Listed Product Weight: 13 lb
- Shipping Dimensions: 12" x 12" x 12"
- UPC: 022315322387
- Package Quantity: 1 Air Blower Kit
Compatible Pentair Pool and Spa Heaters
Pentair 77707-0253 is identified for the following natural gas heater applications:
- Pentair MasterTemp 400NA Natural Gas Heater
- Pentair MasterTemp 400,000 BTU Natural Gas Models
- Sta-Rite Max-E-Therm 400NA Natural Gas Heater
- Sta-Rite Max-E-Therm 400,000 BTU Natural Gas Models
- Other heater configurations specifically listing part 77707-0253
Compatibility Notice: Verify the heater model number, fuel type, manufacturing revision, and original blower part number before ordering. Different heater capacities and propane models require different blower assemblies.
What Does a Pool Heater Combustion Blower Do?
The combustion air blower is an essential component of the gas burner system in compatible Pentair MasterTemp and Sta-Rite Max-E-Therm heaters.
When the heater receives a call for heat, the control system operates the combustion blower as part of its ignition sequence.
The blower moves air through the combustion system, providing the airflow required for the burner to operate as designed.
Proper blower operation is important for reliable heater ignition and combustion.
Signs of a Possible Combustion Blower Problem
A malfunctioning combustion blower may cause the heater to experience ignition or operating problems.
Possible symptoms include:
- Combustion blower fails to start.
- Heater does not complete its ignition sequence.
- Unusual grinding or rattling noises from the blower.
- Blower motor operates intermittently.
- Heater repeatedly shuts down during startup.
- Airflow-related faults or safety shutdowns.
- Physical damage to the blower housing or assembly.
Troubleshooting: These symptoms may also be caused by electrical problems, control board faults, wiring issues, blocked venting, or other heater safety components.
A qualified technician should diagnose the heater before replacing the combustion blower.
Natural Gas vs. Propane Heater Blowers
Pentair manufactures different combustion blower assemblies for specific heater capacities and fuel types.
The 77707-0253 is intended for specified 400,000 BTU natural gas heaters.
- 77707-0253: 400K BTU Natural Gas Combustion Air Blower Kit.
- 77707-0256: 400K BTU Propane Combustion Air Blower Kit.
- 77707-0251: Blower kit for compatible 200K BTU natural gas heaters.
- 77707-0252: Blower kit for compatible 333K BTU Max-E-Therm natural gas heaters.
Important: Blower assemblies must be matched to the heater's specific model and fuel configuration. Do not substitute a blower intended for another heater capacity or fuel type.
Related Pentair Heater Replacement Parts
Aqua Pool Supply carries additional genuine Pentair replacement parts for MasterTemp and Max-E-Therm heaters.
- Pentair 42001-0051S – Combination Gas Control Valve Kit – Replacement gas control valve assembly for compatible MasterTemp and Max-E-Therm heaters.
- Pentair 77707-0010 – Thermal Regulator Kit – Replacement water temperature regulator for compatible Pentair gas heaters.
- Pentair 77707-0077 – Metal Flue Collar, 4" x 8" – Replacement venting component for specified MasterTemp and Max-E-Therm heater installations.
Pentair Heater Parts Diagrams
Use Aqua Pool Supply's illustrated heater parts diagrams to identify compatible burner system components.
- Pentair MasterTemp Heater Parts Diagram – Find replacement combustion blowers, gas valves, burner components, temperature sensors, and other MasterTemp heater parts.
- Sta-Rite Max-E-Therm Heater Parts Diagram – Browse combustion blower assemblies, gas controls, ignition components, and related replacement parts.
Installation and Service Recommendations
Combustion blower replacement involves a gas-fired heating appliance and should be performed by a qualified pool heater service professional.
Before servicing, the technician must disconnect electrical power, shut off the gas supply, and follow Pentair's prescribed procedures.
The installation should include verification of the correct blower assembly, electrical connections, combustion air path, and applicable safety controls.
After installation, the heater must be inspected and tested according to Pentair's service instructions.
Safety: Incorrect installation of combustion components can create fire, gas leakage, or carbon monoxide hazards. Never bypass heater safety controls or operate the heater with damaged combustion or venting components.
Package Contents
Includes: One (1) Genuine Pentair 77707-0253 Combustion Air Blower Replacement Kit for compatible 400K BTU natural gas MasterTemp and Sta-Rite Max-E-Therm heaters.
Kit Information: Pentair identifies this assembly as a replacement blower kit. The Max-E-Therm parts documentation specifies a single-voltage blower adapter. Confirm any additional hardware or gasket requirements against the current manufacturer's kit contents.
Not Included: Complete heater, gas control valve, burner assembly, control board, and other separately listed heater components.
Compatibility: Designed for specified 400,000 BTU natural gas Pentair MasterTemp and Sta-Rite Max-E-Therm heaters. Not intended as a direct replacement for propane heater blower assemblies.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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