VertexTM System Sizing Calculator for an Uncovered Spa Pool or Swim Spa

This interactive sizing calculator will help you size up a Vertex™ solar powered spa heating system for an uncovered or solar blanket covered swim spa or small pool. For a quote please fill out your details on the second "Get a Quote" tab and hit Submit, we'll get back to you via email shortly.

To size a VertexTM system for an outdoor spa that is normally kept covered please use the other calculator here, for conventional solar pool heating systems using a mains powered pump, please use the calculator here.

Note: use Google maps to approximate your collector compass facing direction.

* Use a time and area average, hence if half the pool is shaded for half the day, the setting should be 25%. As another example if 100% of the pool is shaded for half the day use a 50% setting.
§ This is the extension to your existing swimming season you can expect from solar alone.
† This is the anticipated total extension to your existing swimming season you can expect from solar and the specified use of a blanket.
‡ If your return line runs off the roof then down below the water level say, because it needs to run along the ground before going back up into the side of an above ground spa pool, then we need to know the vertical distance from the lowest point of the return line to the top of the water line.

System Sizing Guarantee

Sizing systems is difficult involving a lot of factors which we could get wrong. We stand by this sizing calculator, however if your heating requirements are incorrectly sized and you are not happy with the results we feel that you shouldn’t be charged the extra shipping costs for extra HDPE panels should you require them. Hence EcoOnline offers the following System Sizing Guarantee: If you purchase a heating system and you took our calculators advice on panel sizing and you aren’t happy with the system's performance, then you can purchase up to 25% more panels originally supplied by EcoOnline up to two years after your original purchase and we will ship the items free of shipping charges.

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