Spillover height


Well-known member
May 2, 2018
Miami, Fl
Not sure if this is the right area for this question; my apologies if it’s not.

I’m building a new pool with a spa that spills over into the pool. What is the “usual” height difference between the spa and the spillover? Meaning, how much of a dip is enough for the water to spillover correctly?


Gold Supporter
TFP Guide
Jul 21, 2013
Northern NJ
The spillover defines the water level of the spa and the spa water depth.

The length of the spillover between the top of the spa water and the top of the pool water varies with the design of the pool. It depends how raised the spa will be from the pool level.

I am not sure which dimension you are asking about when you ask about "the “usual” height difference between the spa and the spillover "?

Tres Gatos

Well-known member
Apr 13, 2019
Bullhead City, AZ
I designed the raised spa coping to be 18" above the patio deck for outdoor seating comfort. The spillover drop from the spa water level to the pool ended up being 18" which works fine.

Rocket J Squirrel

Silver Supporter
Bronze Supporter
Jun 7, 2018
Alamo, CA
There doesn't need to be any height difference between the spa and the pool. My integrated spa is level with the pool and spillover is minimal but constant, and the auto-cover covers the spa as well as the pool. It's all about your personal design preference and tolerance for aeration-induced pH rise.

Your signature mentions a heat pump, but no heater. I wonder whether a heat pump can get your spa hot enough.


Well-known member
Jul 16, 2014
Port Neches, TX
I just asked this same question because we can't decide on spa height relative to waterline...
flush or negative spa dam.jpgwaterline tile and raised spa dam.jpgAesthetically we like both ways.
Logically I assume keeping the spa water in (and pool water out) is important, so raised spa dam is best (versus the flush)?