If you know the original spa pack or control brand, you can start by looking up the spa heaters that match your brand and then eliminate from there.
Most spas use one of the six heater assembles shown here. These include two "universal" heater assemblies that can fit a variety of spas. You may be able to match your heater visually from one of these six, then click on the photo to check the details.
All photos, click to enlarge
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#1 Most Popular Heater Assembly
4.0kw, 240v, with pressure switch tap, 15" Replacement for Balboa 4.0kw
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$114.99
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#2 Most Popular Heater Assembly
240V 5.5kW 15"
Replacement for Balboa M7
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$114.99
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#3 Most Popular Heater Assembly
Cal Spas XL Box 4.0kw 15" 240v
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$144.99
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#4 Most Popular Heater Assembly
Brett EM100, EM190, and pre-97 HydroQuip, 5.5kw, 15"
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$69.99
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#5 Most Popular Low Flow Heater Assembly
Laing 240V 5.5KW/4.0KW Low Flow Heater
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$249.00
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#6 Most Popular Low Flow Heater Assembly
Laing 240V 5.5KW/4.0KW Low Flow Heater
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$249.00
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Universal Heater Assembly
Assembly 5.5kW 240v moveable mounts
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$114.99
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Universal Heater Assembly
Assembly 4.0kW 240v moveable mounts
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$114.99
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If you want an exact match of your heater assembly and you don't know your pack brand, you can use the diagram below to match the measurements of your heater. All measurements are from the left flange of the assembly to a terminal, a stud, a pressure switch or the thermal well (if present). Please note that these measurements can be +/- 1/16th of an inch.