Water Heater
What size water heater do i use for my four person hot tub?
I moved into a house that has a four person hot tub but has no water heater. What size water heater do i buy? It is a four person tub, im ot sure how many gallons of water it holds though.
Our four-person hot-tube requires a 5KW, 240V in-line heater. Which, as it happens, is the same as our 2-person hot-tub. They range from 1.5KW to 5.5KW as standard units.
For the most part, the heaters are built into the control units - you will see a shiny (stainless steel) tube about 1-1/2" in diameter as part of the system, usually on the discharge side of the pump, sometimes fully integrated into the controls, sometimes bolted to the bottom, but with the power-connection within the control unit. The heating element (typically a Calrod-type) is within that tube.
When in doubt, however, or if the unit is more than about 15 years old, it will likely pay you to replace the entire system with a modern digital system that includes in-line sensors and controls. There are _many_ sources for these units. We replaced the controls for both our units (each pushing 20 years old) with Balboa units a few years ago and have been very, very pleased with the results. They were true drop-in replacements that came with all the necessary parts to replace the old unit, controls and cables, and with very simple and clear instructions. All we had to supply was the silicon sealant for the new control head.
NOTE: Unless you are comfortable around and understand electricity, DO NOT mess with hot-tub control units. You will need a Ground Fault breaker of the correct type and rating for the system you choose, and you will have to make the correct connections per code. Again, unless you know exactly what you are doing - leave this part to an expert. Your life truly depends on it.
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