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 Pyrex 500mL Heavy Wall Centrifuge Bottle with Plain Top US $24.99 
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 9.5 mm pyrex heavy wall glass tubing 8 pcs x 24" US $24.99
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 3ea Pyrex/Kimax Heavy Wall Filter Flask 1 Liter US $79.99
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 Pyrex Glass tube 1 1/2" X 36" Thick wall US $37.50
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 Pyrex conical 1 1/2" X 18" Thick wall US $37.50
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 Pyrex Glass tubes 1 1/2 " X 48" Thick wall US $47.50
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 Set of 6 Pyrex heavy wall graduated filtering flask 250 US $100.88
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 12 mm standard wall pyrex glass t ubing 12 X 24" US $24.95
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 2L Pyrex Filtering Flask Heavy Wall US $59.99
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Wall Pyrex
Tony Yayo - "King of the Pyrex" Official Music Video - Off GunPowder Guru
Basics About Evacuated Tube Solar Water Heaters
Although you might not believe this, solar water heating is available for hundreds of years. As we noticed advancements in technology all became even more efficient and we now see around 90 percent efficiency with evacuated tube water heaters based on solar power. Basically you will see 90 percent of all the sun's energy being absorbed and then converted properly into heat. You are to see incredibly low energy generating costs if you compare to a regular source.The info was given by a gutter cleaner who also delt with inverter and installation of hot water cylinders.
Vacuum tubes or even evacuated tubes are mostly made from glass. In most situations we see a double wall system based on Pyrex. Special absorbing coating is utilized in order to couat the outer surface of the glass inside the inner tube. Inside every single tube the air is usually removed so that a vacuum is created. Copper heat pipes are located right in the middle of these tubes. Such a sealed heat pipe is good as it also includes in most possible cases anti freeze liquid and can help in absorbing infra red radiation better.
The one big advantage that appears with the use of evacuated tubes in solar water heating stands in the fact that these also work when we are faced with cold weather. Vaccums will prevent heat tubes from ending cooled too much by the temperature of the ambient. Also, thanks to evacuated tube systems you can also take advantage of the little sun power that we see during winter. In different circumstances you might be faced with the water being heated to 50 degrees by using just the water heater system.
Evacuated tubes were definitely not popular in the past because they were not available for all people. In most situations they were utilized in different commercial equipments and they were really expensive. People could not include them in any system they created. Nowadays this type of tubes is available and you need to know that they are actually recommended. You would end up with a lot more efficiency in your solar water heater system if it includes good evacuated tubes.
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Frequently Asked Questions...
Bell Jar fish tank?
I want to make an aquarium out of a Pyrex Bell Jar (#452263) by placing the rounded end in a cradle frame. The measurements are 18"OD x 30 3/16 HT with a wall thickness of 3/16. The volume will be around 30 gallons with a weight of around 250 pounds. Will the bell jar explode from the water weight? Any design ideas or suggestions for a narrow tall tank? FYI - I have 3 of the jars 
Answer:
It shouldn't break. It's Pyrex®. What I would do is, get the jar, put the water in it, add some gravel(if you are going to use it) and put it outside, not in the sun directly, and wait a few days or a week(if you have the patience). If it breaks, well, then you saved yourself a hell of a worse clean up. If it doesn't, then head on to your plans.
But good idea though, I like it.
