You know the problem: a swimming pool/pond without extra heating is only pleasantly warm for about 3 to 4 weeks during the summer - a very short amount of time compared to the high investment and high maintenance a pool requires. An indoor pool even needs to be heated the complete year, which, considering the conventional energy sources, costs a lot of money and is not very environmental friendly. There is an other possibility! The heating of pools is the perfect application for the free and environmental friendly solar energy. Because no high temperatures are needed, but relatively a large amount of water needs to be heated, it is very effective to operate these installations at a high flow rate and on a relatively low temperature. OKU collectors are moulded in one peace and are colored homogeneous black. The system can normally be used with the existing filter pump. Corrosion and pool water resistant. The (pool)water is pumped directly through the collectors. OKU collectors are frost resistant and can hold human
weight.

There are 3 easy connection variations:
1. with the filter pump over a automatic 3-way ball valve with thermostat.
2. with an own pump and thermostat in a circular flow.
3. with an own pump, thermostat and plumbing, disconnected from the filter system.

See table on the right for the recommended collector size in % of the pool size for outdoor pools with covers or indoor
pools (beginning of may up to september). Temperature increase 4 - 7°C in comparison with not heated pools. Without a cover the collector size ought to be 50% bigger. The local differences in hours of sun per day can in- or decrease the collector size with 20%.

Pumps: recommended flow rate is 150 up to 250 liters per m² collector surface per hour. The recommended capacity of the
pump can be easily calculated: the collector surface x 200 liters. The pressure loss can be determined by taking the difference in height between the water level and collectors and add 5 metre.

Technical specifications
Very low pressure loss: ± 0,003 bar at 200 liters/hour per m².
Flow rate: 150 - 250 liters/hour per m².
Weight: app. 6 kg/m² - water volume 6 liters/m².
Max. press.: 4,5 bar. Operating press.: 1,2 bar at 40°C.
Output: up to app. 85% - capacity up to 0,85 Kwh/m².
Average output: 0,5 - 0,6 Kwh/m².
Temperature resistant from -50°C up to +115°C.