High Performance


Spas are wonderful. Big electric bills are not. So we make sure our spas are energy efficient. While many spas claim to be fully foamed, they often use only cheaper, low-density, open-cell foam. Hot Spring® spas, by contrast, are totally insulated, not just fully foamed. The difference lies in our use of multiple layers of high-density, closed-cell polyurethane foam, the same material used to insulate commercial freezers.

In addition, our pumps and heater are designed to deliver maximum performance using minimum energy. And our warm air induction system captures heated air by the jet pump and directs it into the spa’s water, slowing the water’s cool down rate and saving energy. Once you own a Hot Spring spa, you’ll really appreciate its lower operating costs.

Air v Foam Insulation

Hot Spring Spa Insulation vs. Air Insulation.

Manufacturers’ Claims can be confusing. Get the facts.

Hot Spring, The Energy Smart Spa, is fully insulated with multiple layers of high-density polyurethane foam.

Layers of foam are strategically applied to the spa shell and within the cabinet cavity. Foam density varies, including 30 lb, 2 lb, 5 lb and 40 lb foam to provide significant energy efficiency.

When considering purchasing a spa with “air space” insulation, you should know…

When air is trapped in a small space it is unable to move, therefore it is unable to create a convection (movement) atmosphere. In this environment air can be a relatively good insulator, for example in thermal windows. However, if you didn’t need to see through windows foam would be a better insulator.

In large, unobstructed areas such as air gaps in some spas, the air is free to move. This establishes a convection(movement) atmosphere in which heat is readily lost. For example, when you blow air over a hot drink it cools very quickly. When air cannot move it’s a good insulator, but when it can move it’s a poor insulator.

Further, When the relative humidity level in the air is high (as in a spa), air’s thermal properties are further reduced.
Convection + High Humidity = Low Thermal Properties of Air

To get a better understanding of Hot Spring Spa insulation vs. Air insulation, you should know…

Material Thickness “R” Value*
Polyurethane Foam (Hot Spring) 1″ 6.25″ inch/inch
Air Space (includes convection) 1″ 0.90″ inch/inch

*“R” value is a rating of insulating materials – the higher the “R” Value the better the insulation.

Polyurethane Foam is more that 6 times better than air as an insulator.

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