Product Overview

The MasterTemp® 125 K BTU heater (model 461058) is a high-efficiency pool heater engineered for residential applications. Featuring pre-mixed gas combustion technology with approximately 82% thermal efficiency and compatible with 1½″ plumbing, this durable unit offers digital controls, low-NOx certification, and compact, lightweight construction for simplified installation.

Ideal For

• Residential in-ground or above-ground pools up to ~15,000 gallons seeking reliable heating capacity. 

• Installations where 1½″ plumbing is already in place and replacing an aging or under-sized heater.

• Pool owners looking for modern digital control interfaces and advanced diagnostics in a compact heater footprint.

• Systems requiring dual voltage capability (120/240 VAC) and versatile application. 

Key Features

• 125,000 BTU output – delivers strong heating for residential pool/spa combinations. 

• 1½″ plumbing connections – ideal for smaller-scale pools and simplifies retrofit. 

• 82% thermal efficiency – among the highest in its class, providing energy savings and performance. 

• Digital display controller – advanced interface for programming, diagnostics and monitoring.

• Low NOx certified and corrosion-resistant enclosure – built for durability, both indoors and outdoors. Compact, lightweight design (~80-100 lbs) – easier handling and quicker install compared to larger heaters.

Customer-Facing Q&A

Q: Will this heater work with my existing 1½″ plumbing line?
A: Yes — this model is designed for 1½″ plumbing connections, making it compatible with standard residential pool pipe runs.

Q: Does it support both 120 V and 240 V electrical?
A: Yes — the model supports 120/240 VAC wiring, enabling flexible integration based on your equipment pad voltage.

Q: Is it suitable for above-ground as well as in-ground pools?
A: Yes — it’s engineered for residential pools of up to approximately 15,000 gallons, including compatible above-ground and in-ground applications.

Q: How efficient is it compared to older heaters?
A: With approximate 82% thermal efficiency, this heater provides significantly better energy performance compared to many legacy models.

Q: What maintenance should I expect?
A: Basic upkeep includes verifying proper gas supply, ensuring correct water flow, cleaning the heat exchanger as needed, and monitoring system diagnostics via the digital display.