That's quite a specific heater! The Raypak P-R206A-EN-C #50 is a digital natural gas heater designed for pools and spas. Here's a breakdown of what that model number tells us:  

• P-R206A: This is the core model designation within Raypak's Pro Series (P-R). The "206A" likely indicates the BTU output range.
• EN: This signifies that it's a natural gas model.
• C: This often indicates specific features or certifications for the Canadian market, but it's also used in the US.
• #50: This is likely a specific configuration or revision number.

And the description you provided gives us even more details:

• Digital: This means it has an electronic control panel for precise temperature setting and diagnostics.  
• 199.5K BTU: This indicates the heating capacity of the unit – 199,500 British Thermal Units per hour. This is a substantial heater suitable for larger residential pools or smaller commercial applications.
• Electronic Ignition: This provides reliable and convenient startup without the need for a pilot light.  
• Polymer Headers: These are corrosion-resistant and help to extend the life of the heater.  
• Copper Exchanger: Copper is a highly efficient heat conductor, ensuring rapid heating of the water.  
• 200 lbs: This is the approximate weight of the unit, which is important for installation considerations.
• 009216: This is likely the manufacturer's part number or SKU for this specific model.

So, in a nutshell, you're looking at a robust and efficient Raypak digital natural gas pool and spa heater with a significant heating capacity, durable components, and electronic ignition.