The document summarizes the history and development of solar water heating. It describes how the first solar water heater was invented in the early 1900s in the US. Solar water heating later grew popular in other countries like Israel and Greece in the mid-20th century. The document also profiles the Greek company Venman, a leading manufacturer of solar water heaters and components, and describes its founder and manufacturing processes that ensure high product quality standards.

2. How it all started.

3. World’s first solar water heater was installed in the U.S. at early 1900’s
It was a simple construction consisting mainly from a steel barrel placed inside an insulated
wooden box with a glass on top,

4. For many years, solar water heaters were considered to be an expensive investment that
“didn’t” pay for the price without any financial interest, until the financial crisis of early 50’s
in Israel, led Levi Yissar, an Israeli inventor to complete his prototype solar collector and
to establish the first solar water heater company in the World in 1953: NerYah.
The history of solar water heating had just begun, but it took several years for
manufacturers to become able to produce effective solar water heaters at a reasonable
price.

5. Greece was an early adopter of the new
solar technology.
The first solar water heater appeared in
1974, and in 1980, 6 years after, there
were more than 150.000 solar water
heaters installed in Greece.
Today, more than 50% of Greek
buildings have a solar water heater
installed (more than 2.000.000 installed
solar water heaters), and this makes
Greece the 3rd European country in
terms of installed domestic hot water
solar heaters.
The Greek solar water heating market is
a highly competitive market.
Solar water heating in Greece

6. Venman founder Mr Iordanis Kioupelis has been in the solar water heater market since
early 1980’s when the Greek government subsidized the installation of solar water heaters,
a thing that helped the Greek solar water heating market grow very fast.
With more than 20 invention patents in his
energetic, most of which involve to solar energy,
Mr Kioupelis started manufacturing high quality
solar water heater tanks for the biggest heating
distribution network at that time.
Years before solar water heating
standardization, Mr Kioupelis silently kept
inventing and improving solar water heating
products and created the first pure OEM solar
water heating company in Greece.
His dedication, perfectionism and
professionalism, quickly led his company to
success and today, he is considered to be an
influencer in the Greek Solar water heating
manufacturer circles.

7. Today, his company Venman is directed by his 2 sons, based in the same principles of
honesty, dedication and professionalism.
Venman is the leader OEM manufacturer in Greece, producing solar water heating
products, including:
• high quality solar collectors
• solar water heater tanks of any size up to 9.000lt,
• compact natural flow solar water heaters,
• food grade solar water heater expansion tanks
•complete product range for the solar water heating market.
Venman S.A.

8. Uses of Solar Energy

9. Natural Flow
Solar Water Heaters.

12. Forced circulation
Solar Water Systems.

14. Forced circulation Solar system Components

15. Large Size
forced circulation
Solar systems

16. Large Size
forced circulation
Solar systems

17. Solar Collectors.

21. Hydraulic diagram of solar collector

22. Back sheet metal
Polyourethane insulation
Aluminum foil
Additional mineral wool insulation
Aluminum foil
Low friction Φ10 collector piping
Full face copper collector
Iron free hot tempered glass
Aluminum case with air vent and
Condensation drainage.
High efficiency solar collector

23. Air vent and condensation drainage channel

25. Parallel vs Serial collector connection

26. Solar collector connection types

27. Solar collector connection types

28. Collector Placement

29. Collector Placement

30. Solar Collector installation.

31. Solar Water Heater Tank.

34. External sheet metal foil
Heavy 48kgr/m3 polyurethane insulation
Heating jacket
Glass protective coating
(low carbon sheet metal)

35. Vacuum solar water heater tank, especially designed for hard water areas.
The internal antennas ensure proper heat transfer from vacuum lamps to the water mass,
Ensuring breakdown of any mineral salt cores.
Vacuum type solar water heater tank.

37. Piping

38. Other Solar Installation
Components.

44. Manufacturing process.

46. CNC Punching

47. CNC Laser cutting

48. Robotics

49. Robotics

50. Robotics

51. Large Presses

52. Automatic welding

53. Automatic formation

54. Automatic welding

55. CNC forming

56. CNC cylindering

57. Sheet metal plotters

58. Packaging line

59. enameling

60. Superiority is in the details

61. Quality Standards
According to the latest (high demanding) European standards, solar products must comply:
• EN 10130/2006 for metal steel sheets
• Boiler insulation according to DIN 53420 / DIN 4102
• Enameling according to DIN 4753-3
• Pressure tests according to EN 12976-1
• External covering according to EN 10204
Product quality must be certified from well known native and international organizations and
laboratories like Democritus laboratories and TUV.
The collectors are Solarkeymark certified.
All manufacturing stages must include detailed
quality control processes that ensure
minimum product defect rates.

62. Thank you!