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The most common type. They are "plug-and-play" simple—literally, in many cases—and are generally efficient.
These offer rapid heating (1–2° per minute) and lower operational costs in some areas, but they are expensive to install and require a certified gas contractor. buy hot tub heater
Modern heaters often use smart sensors (like the Balboa M7) mounted inside the heater, eliminating the need for an external pressure switch. The most common type
Before buying a new heater, you must know your current setup. you must know your current setup.