Pentair MasterTemp® Natural Gas High Performance Heater 250K BTU
The Pentair MasterTemp® Natural Gas High Performance Heater 250K BTU offers all the efficiency, convenience, and reliability features you want in a pool heater — plus a lot more. As easy to use as your home heating system, with a user-friendly rotating LCD display and troubleshoot icons that make operation and monitoring a snap. The compact design and super-quiet operation won't intrude on your poolside leisure time.
Built by Pentair with a heavy-duty cupro-nickel heat exchanger that stands up to the harshest applications — low pH, high flow, or heavy use — the MasterTemp 250K BTU heats up fast, delivers best-in-class energy efficiency, and is certified for Low NOx emissions. CSA certified. Backed by a 2-year limited warranty.
⚠️ Professional Installation Required. Pool heater installation involves gas line connections and electrical wiring. Always use a licensed contractor to ensure safety, code compliance, and warranty validity.
Key Features
250,000 BTU Output
High-capacity natural gas heating for pools and spas.
Cupro-Nickel Heat Exchanger (HD)
Heavy-duty exchanger withstands low pH, high flow, and heavy use — ideal for demanding applications.
Best-in-Class Energy Efficiency
Green certified — outperforms industry standards for efficiency.
Heats Up Fast
No long waits before enjoying your pool or spa.
Rotating Digital Display
User-friendly LCD with troubleshoot icons — easy to read from any angle.
Low NOx Emissions
Eco-friendly and certified to outperform industry emission standards.
Rustproof Exterior
Tough exterior handles heat and weathers the elements.
Super-Quiet Operation
Compact, quiet design won't intrude on poolside leisure.
Manual Gas Shut-Off
Built-in manual gas shut-off when service is required.
2-Year Limited Warranty
Pentair residential warranty coverage.
Who It's For
- Pool and spa owners wanting fast, efficient natural gas heating
- Salt water and chemically demanding pools that benefit from a cupro-nickel heat exchanger
- Indoor and outdoor pool installations
- Anyone upgrading from an older heater to a quieter, more efficient MasterTemp
Specifications
Heating Performance
| BTU Input | 250,000 BTU |
| Fuel Type | Natural Gas |
| Emissions | Low NOx Certified |
| Max Flow Rate | 120 GPM |
Construction
| Heat Exchanger | Cupro-Nickel (HD) |
| Control Type | Digital (Rotating LCD Display) |
| Exterior | Rustproof |
Installation
| Gas Connection | 0.75 in |
| Voltage | 120V / 240V |
| Frequency | 60 Hz |
| Phase | Single |
| Application | Indoor / Outdoor / Pool / Spa |
Physical
| Product Weight | 133 lb |
| Cabinet Dimensions | 23 W × 28.2 D × 21 H in |
| Shipping Dimensions | 36 × 23 × 30 in |
Approvals & Warranty
| Certifications | CSA Certified |
| Energy Efficient | Yes (Green Certified) |
| Warranty | 2 Years Limited |
What's in the Box
- Pentair MasterTemp 250K BTU Natural Gas Heater
- Union Fittings
- User Manual
Warranty
The MasterTemp 250K BTU comes with a 2-year limited manufacturer warranty from Pentair. Clearflow Pool Supply is an authorized Pentair dealer and will assist with any warranty service needed.
Downloads
Frequently Asked Questions
Does the MasterTemp require professional installation?
Yes. Gas heater installation involves connecting to a natural gas supply line, electrical wiring, and proper venting. A licensed pool contractor or plumber must perform the installation to ensure safety, local code compliance, and warranty validity.
Why is a cupro-nickel heat exchanger important?
Cupro-nickel is significantly more resistant to corrosion from low pH water, salt water, and pool chemicals than standard copper. For chemically demanding pools, high-flow applications, or heavy use environments, the HD cupro-nickel exchanger in the MasterTemp provides longer service life and lower maintenance costs.
Is this heater compatible with salt water pools?
Yes. The heavy-duty cupro-nickel heat exchanger is specifically chosen for its superior resistance to salt water corrosion, making the MasterTemp a strong choice for salt water pool installations.
What size pool is the 250K BTU suitable for?
As a general guideline, 250,000 BTU is typically suited for pools in the 15,000-30,000 gallon range depending on climate, desired temperature rise, and heat loss factors. A licensed pool professional can calculate the correct BTU for your specific pool and location.
Can the MasterTemp be used indoors?
Yes. The MasterTemp is rated for both indoor and outdoor installation. Indoor installations require proper venting per local code. Consult the install guide and a licensed contractor for indoor venting requirements.