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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.

The most common type. They are "plug-and-play" simple—literally, in many cases—and are generally efficient. buy hot tub heater

Hot Tub Heater Buying Guide: Keep the Heat On Is your hot tub lukewarm, or has the heater finally called it quits? Replacing a hot tub heater is a common repair, but choosing the right one requires knowing your system's voltage and flow requirements. These offer rapid heating (1–2° per minute) and