flat roof solar

Powerstrips on a flat roof.

PV and pool solar

Powerstrips on a tile roof fitted around a PV system.

Solar pool heaters are no longer just plastic black rectangles strapped to the roof of a house with non-structural roof penetrations. Today's technology allows these systems to be fitted to the roof space and secured structurally often with no roof penetrations at all. Powerstrips, manufactured by Hot Sun Industries of San Diego California are freeze tolerant, serviceable, modular and repairable. Fitted tighter to the roof than rigid sheet polypropylene solar panels means less wind loss and better performance per collector area all without sacrificing the value of the home.

solar types compared

Powerstrips vs other types.

solar hidden on a pergola

Powerstrips hidden on a pergola.


In some of our primary markets, namely Arizona and Southern California, including Riverside, LA, and San Diego counties, as well as the Bay area of San Francisco, residential customers find solar pool heaters are the only heaters they need. In Canada however, it is common that solar and gas or even heat pumps have to work together. Commercial pools everywhere generally require the more consistent pool temperature guarantee of a gas heater or heat pump. Adding solar can mean adding problematic logistical complexity in these cases. Our proprietary SWIM PC,(Solar Water Internet Monitoring Programmable Controller) technology allows the two heating systems to work together optimally with an online interface. This has been a key missing ingredient in the solar thermal industry up until now.


We've compiled performance charts for many areas around North America and verified them with hundreds of real solar heated pools. Click on your region to get an idea of what solar can do for a pool in your area. See the section on the navigation bar called "Regional Performance Curves".

Below is is a typical pool in San Diego, California with a little pool shade, located near the ocean where the collectors are on a south facing roof.

solar heater performance chart San Diego

100% solar means a solar heater sized at 100% (same size) as the top surface of the pool.

Go to sizing for the recommended amount of solar for any given pool. Then go to the section of this web site designed for the roof type solar will marry to and you'll find most of the information you need. If you'd like to call us at 858 683 0800 please gather this information first.


Any solar panel can go on a pitched shingle roof but Powerstrips aren't restricted to standard sizes. Powerstrips are flexible meaning the absorber section doesn't have to shift side to side across the shingles as the header manifolds expand and contract with temperature. Flexibility allows the option to glue the absorber to the roof rather than strapping and bolting.

Another important advantage we have on shingle roofs is that we can secure both header manifolds to the roof. Polypropylene grid style collectors have to dangle under straps because one header has to be able to move to accomodate the collector shrinking with temperature drop. Flexibility allows Powerstrips to just stretch.

Headers can be arranged vertically and the fin tubing (absorber) glued down sideways. An entire system can be secured to the roof with only 6 roof connections into the rafters; structurally sound and leak free. High wind ratings are easy to achieve compared to rigid polypropylene collectors.

Finally the flexible material removes all major fear of freeze damage and is fully repairable in the field.

For all the details we need to give you a price quote go to shingle and metal roof installations


Powerstrips were originally developed specifically for tile roofs. The flexible material follows the wave of the tiles to some extent. The system is built on the roof to fit the roof making best use of available space and creating a system that adds value to the home instead of taking it away. One foot wide sections fit each row of tiles meaning that the ends of the tiles are exposed so when you look up at it from ground level you see the ends of the tiles. No roof penetrations, best use of available space, best esthetics, and easiest hurricane rating approvals make Powerstrip the only choice for a tile roof mounted solar pool heater. More on Powerstrips on tile roofs


A separate solar heater that doesn't involve the roof of your home has appeal but it takes up real estate and you may not want to look at it. Powerstrip solar collectors are not constrained to the normal 4x12 and 4x10 sizes. We can build a structure to fit the landscape. In fact, in many cases it makes sense to mount the solar collector system right to the earth. This option is especially attractive when the ground space is steep.

We can double up the header manifolds at each end eliminating the spaces between the one foot wide sections. This means the solar collector itself can act as weedcloth and we can pack more solar into less space. More on ground mounting and rack mounting.


You can not use a regular polypropylene fixed size collector on a flat roof for 2 reasons. The water won't drain out of it so it'll freeze and burst. Secondly, you have to bolt down that rigid "sail" so it won't fly off the roof. Don't make a roof penetration on a flat roof.

Hot Sun's Powerstrip flexible solar collectors are often secured with a ballasted framework. We developed this system for commercial installations. It can be removed easily for roof resurfacing.

Take a look at these flat roof installations.

Hot Sun solar hot swimming pool

Click on sizing to learn all about what to expect from a solar heater. You'll find a form you can fill in so we can help your local dealer fully specify and quote your installed solar heater. If you want to contract this out yourself or install it yourself we specialize in providing the expert support you need.

Hot Sun Industries Inc.,

San Diego,


Note we have representatives in many regions and our products are easily shipped.

Before phoning
please measure the pool and roof and gather the information we need to assist you in pricing. Click sizing for a list.