Top 10 Best mastertemp 400 in 2026

Last Updated - 6/20/2026

🏆Best Choice

Funmit

Funmit 42002-0024S Stack Flue Sensor Replacement for Pentair Sta-Rite MasterTemp Max-E-Therm Pool and Spa Heater Electrical System SR200 SR333 SR400

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•𝗨𝗡𝗜𝗩𝗘𝗥𝗦𝗔𝗟 𝗖𝗢𝗠𝗣𝗔𝗧𝗜𝗕𝗜𝗟𝗜𝗧𝗬 - 42002-0024S Stack Flue Sensor Replacement for Pentair MasterTemp pool and spa heater electrical systems, also fit for Pentair Sta-Rite Max-E-Therm pool and spa heater electrical systems model SR200, SR333, SR400.
•𝗗𝗜𝗥𝗘𝗖𝗧 𝗥𝗘𝗣𝗟𝗔𝗖𝗘𝗠𝗘𝗡𝗧 - Replaces OEM Part No. 42002-0024S sensor parts. Please double check part # before you buy.
•𝗕𝗔𝗦𝗜𝗖 𝗙𝗨𝗡𝗖𝗧𝗜𝗢𝗡 - The Stack Flue Sensor prevents the flue gas output from exceeding 500 degrees F, operating temperature from -20°C to 105°C, and fix typical error codes E-02, E-05 and E-06.
•𝗣𝗥𝗘𝗠𝗜𝗨𝗠 𝗤𝗨𝗔𝗟𝗜𝗧𝗬 - Made of sturdy Stainless Steel material with smooth thread, easy to replace and install few minutes. Turn off the power before replacing it and wear work gloves to protect your hands.
•𝗦𝗛𝗢𝗣 𝗪𝗜𝗧𝗛 𝗖𝗢𝗡𝗙𝗜𝗗𝗘𝗡𝗖𝗘 - Funmit adhere to provide all customers with a simple, streamlined shopping experience of large appliance replacement parts, and prove that we have the highest quality parts and service out there. We stand by our products, and our customers are our focus as a business. If you have any quality problem, please contact Funmit customer service team in time, and we will try our best to solve your problems

View offer on:

$15.99

$17.99

-11%

Check Price

ZAIGANMA

ZAIGANMA Pool Heater Repair Kit 42002-0024S 42001-0063S 42001-0053S Heater Thermistor 42001-0060S 42002-0025S Replacement for Pentair Sta Rite MasterTemp &Max-E-Thermistors Pool Spa Hearter Repair Kit

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•【Compatible With】The pool heater repair kit compatible with Pentair Sta-Rite, MasterTemp, Sta Rite Max-E-Therm pool and spa heaters electrical systems. It's pool water heater 400 replacement parts/sensor kit
•【Replacement OE No.】This Stack Flue Sensor OE part number:42002-0024S, 42001-0063S, 42001-0053S, 42001-0060S, 42002-0025S, PLEASE MAKE SURE OF THE COMPATIBLE POOL AND SPA HEATERS ELECTRICAL SYSTEMS BEFORE ORDERING, THANKS
•【Product Advantages】Gas Shutoff Switch (42002-0025S) designed to detect when water temperature exceeds 140F and automatically open heat exchanger outlet; 42001-0053S, thermistors are lightweight, and have low thermal inertia. Good reliability and stability. It made from upgrade materials, work stabily at various temperatures . It can control comfortable pool; High Limit Switch (42001-0063S) sensor detects when water temperature exceeds safe level and automatically opens heat exchanger outlet
•【Product Feature】42002-0024S, the stack flue sensor prevents the flue gas output from exceeding 500 degrees F, operating temperature from -20℃ to 105℃, and fix typical error codes E-02, E-05 and E-05; 42001-0063S, when water temperature exceeds safe level, it can open heat exchanger outlet automatically; 42001-0053S, monitor the temperature in the vicinity of the heating element and adjust the heating power through the control system to maintain the set temperature
•【Customer's Approval】 Choosing the ZAIGANMA pool heater repair kit is a really good idea when you need a sturdy and new one. Strict quality control of products before they leave the factory is a necessary operation in our store. If you have some question about product, you can write e-mails to us

View offer on:

$41.97

$43.97

-5%

Check Price

Misakomo

Thermal Regulator Compatible with MasterTemp 400 250 125 200 300 333 Models and Sta-Rite Pool Spa Heaters SR200 SR333 SR400 Models, Replace# 77707-0010, 38000-0007S

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•【NEEDS】As time goes on, your heater developed a problem where it turns on and off constantly before target temperature was reached. Simply replace this pool heater thermostat control to get rid of the experience where the water temperature take forever to heat up.
•【FASTER HEATING】The mastertemp sta rite thermistor has undergone extensive testing, means you will get a fairly reliable thermal regulator to help get your pool spa heater operational, quickly warm the water up and reach the comfortable temperature you want.
•【PREMIUM QUALITY】Long life-span matters, that is why our thermal regulator is composed of high-quality metal, which can effectively prevent corrosion and rust, greatly increase the service life even in salt water environment.
•【FITS】The thermal regulator kit is designed to use with Master Temp, Sta-Rite Max-E-Therm pool and spa heaters, and it is located between the inlet and outlet water connections on the water manifold. Product kit includes regulator, spring and cap.
•【12-MONTH WARRANTY】 If for any reason at all, you are not fully satisfied with the thermistor, simply contact us through amazon message at any time. We will provide comprehensive quality assurance for our product.

View offer on:

$21.19

Check Price

Pentair

Pentair 77707-0054 Igniter and Gasket Replacement Kit Pool/Spa Heater

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•Genuine OEM Pentair Replacement Part
•Igniter replacement kit

View offer on:

$55.00

$81.95

-33%

Check Price

GAQUECY

GAQUECY 2" Half PKG188 Heater Union Adapter Compatible with Pentair Mastertemp 400, 250, 200, Also Fits for MaxeTherm Heaters and Sta Rite, 42001-0402 2 Inch Slip Half Union Adapter (2 Pack)

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•【What you Get】You will receive the PKG188 heater union kit, include 2x union adapters, 2x nuts, 2x o-rings.
•【Compatibility】2 inch half union adapters are compatible with Pentair mastertemp 400, mastertemp 250 heater, sta rite pool heater.
•【More Compatibility】The heater unions also fit for Pentair mastertemp heater 460732, 460734, 460736, Max-E-Therm SR200NA, SR333NA, SR400NA.
•【Excellent Quality】Made of high quality PVC and hard plastic to withstand high pressure and extreme temperatures to ensure long lasting performance.
•【Note】Please confirm the size of your desired model before purchase to avoid any inconvenience caused by our products not meeting your needs.

View offer on:

$14.99

Check Price

Optimum Pool Technologies

Optimum Pool Technologies® Heater Repair Kit Compatible Replacements for Pentair® MasterTemp & Max-E-Therm - Thermistors & Switches

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•Kit Includes: Stack Flue Sensor, Thermistor, Pressure Switch, Hi Limit Switch 135°F & Gas Shutoff Switch 140°F.
•Compatible Replacements for Part Numbers: 42002-0024S, 42001-0053S, 42001-0060S (3902), 42002-0025S, 42001-0063S.
•All parts compatible replacements for Pentair Master Temp & Max E Therm Pool Heaters
•Manufactured by Optimum Pool Technologies
•NOTE: This is a compatible aftermarket replacement part. The manufacturers' names and part numbers have been used for reference purposes only. Optimum Pool Technologies Inc is an independent brand.

View offer on:

$99.00

Check Price

POAXSSW

POAXSSW 42002-0007S Control Board Kit with 472610Z Switch Pad Compatible，Pad for Pentair MasterTemp 200/250/300/400 for Sta-Rite SR200/SR33/SR400

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•【Product】includes 1pc 42002-0007S Control Board and 1pc 42002-0029Z/472610Z Film Pad.
•【Function】: This product will help you deal with temperature adjustment failures or button hardness issues, while also improving heating efficiency.
•【Compatibility】This board is suitable for MasterTemp heaters: Mastertemp 200, Mastertemp 250, Mastertemp 300, Mastertemp 400. Sta-Rite Max-E-Therm Heaters: SR200NA, SR333NA, SR400NA, SR200HD, SR333HD, SR400HD, 460805. As well as all NA and LP series pool/spa heater electrical systems.

View offer on:

$61.68

$64.68

-5%

Check Price

VODCACA

VODCACA 77707-0010 Thermal Regulator Kit Replacement for Pentair Mastertemp 400/333/ 300/200/ 125 & Starite Pool Heater SR200/ SR333/ SR400

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•Wide Application: Compatible with Pentair Mastertemp pool spa heaters 125/ 200/ 300/ 333/ 400, Fit for Pentair Sta-Rite Max-E-Therm pool spa heaters SR200/ SR333/ SR400.
•Ideal Replacement: Solve problem: Generally speaking, the thermal regulator start open when the water heated to about 150F. It may need to replaces the thermal regulator if it opens too high or too low. Our kit offers a more suitable solution.
•Functional Description: The thermal regulator warm the water of pentair mastertemp & pentair sta rite Max-E-Therm up quickly and reach the comfortable target temperature.
•Installation: The thermal regulator is located between the inlet and outlet water connections on the water manifold. (It is held in place by a spring)
•Quality Assurance: VODCACA is committed to producing high quality products and providing customers with a good shopping experience. if you encounter any quality problems during use, please feel free to consult us via Amazon mail. We will get back to you as soon as possible and provide you with a satisfactory solution.

View offer on:

$18.95

Check Price

E-cowlboy

Pool Heater Manifold Assembly Replacement Kit for Pentair MasterTemp 175, 200, 250, 300, 400 & Sta-Rite Max-e-Therm SR200, SR333, SR400, 77707-0205, 77707-0206, 77707-0014, 77707-0015, 77707-0016

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•Perfectly Matched to Your Heater: This manifold assembly is precision-engineered to provide an exact fit for Pentair MasterTemp (175, 200, 250, 300, 400) and Sta-Rite Max-e-Therm (SR200, SR333, SR400) pool and spa heaters. It's your assurance of a seamless, trouble-free installation.
•Compatible with Multiple Part Numbers: Our assembly is a versatile replacement, directly compatible with part numbers 77707-0205, 77707-0206, 77707-0014, 77707-0015, 77707-0016, 77707-0010, 77707-0017, and 460748. You'll have the perfect replacement manifold for your specific heater.
•Complete Replacement Kit for Effortless Installation: Our assembly includes the manifold body, backplate, gaskets, sensors, drain plug, and bolts - everything you need for a hassle-free installation. Say goodbye to complicated and time-consuming processes with our comprehensive kit.
•Premium Quality Craftsmanship: We take pride in delivering a top-quality manifold assembly that faithfully replicates the shape and function of the original parts you're replacing. It's built for durability and dependable performance. Replacing your manifold assembly is now a breeze, and the on/off process is hassle-free, saving you valuable time.

View offer on:

$72.99

Check Price

MasterTemp

MasterTemp Pool Heaters 400K BTU - Natural Gas

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•Built to last with tough rust proof exterior
•Premix combustion technology for fast and efficient warm-ups
•Built in safety features to ensure system protection
•Rotatable, easy-to-use, intuitive operation controls
•Certified for outdoor and indoor installation

View offer on:

$4499.00

Check Price

📊

📈 How we rank

With our cutting-edge technology, we examine thousands of products and retailers, assessing reviews, ratings, trends, and sales rankings to identify what matters most to users like you.

Our team evaluates this data alongside genuine user feedback, merging AI analysis with human insights to provide you with real-time, highly-rated recommendations that empower your decision-making with clarity and confidence.