Electrical Device Connected to the Spa Control Pack, either remotely or directly in the same unit. (Fig.1)
Normally constructed with a stainless-steeNormally constructed with a stainless-steel housing. (Fig.2)
Connected to water plumbing of the main Circulation or 2-speed pump.(Fig.3)
Fig. 3: Pump plumbing connected to heater
Fig. 4: Fully immersed heating element
Spa heaters are controlled by the main control system and monitored by safety devices such as high-limit switches and temperature sensors (Fig.5), thermostats (Fig.6), flow or pressure switches (Fig.7), and other flow detection devices.
Fig. 5b: High limit and temperature sensor
By far the largest electrical draw on the circuit that powers the spa.
Most 230v systems with electrical heaters require a dedicated 50–60 amp service to power the spa.
Most 115v systems with electrical heaters require a dedicated 20 amp service to power the spa.
All Spas require the electrical circuit to be GFCI protected. (Fig.8)
Fig. 8c: GFCI breaker 230v
How Does an Electric Spa Heater Work?
Electric Spa Heaters are part of the filtration system for the spa.
Water from the spa enters the plumbing from the skimmer or suctions and is pulled into the circulation pump. The pump then pushes the water through the system, entering and exiting the heater before it continues through the plumbing and out the jets or returns. When the electric element inside the heater is energized, the water that travels through the heater is heated slightly as it passes. This is a slow process especially when the water is cold to begin with. Most 230v spas require 18+ hours to heat up to set temperature from a cold fill. 115v spas can take over 24 hours to reach desired temperature.
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