Horizontal Solar Evac Tube?

Unknown

evac tubes that can be laid flat or on their side. They are a flow through design not a heat pipe. They are what they call a u-tube because the water just flows in a copper u-tube inside the double wall glass tube. The evac tube just slips over the u-tubes after you are finished installing the system, they are nice looking and do not need minimum pitch but they canot be used with a drainback system.

singh

Viessmann

Is coming out with a horizontal model some time in 2009. Tubes look the same.
Just curious to see if anyone can explain how that one works? From the looks of it, the header is on the side, therefore, how does the liquid in the heat pipe boil and exchange.

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Andrew Hagen_4

Horizontal?

How would it shed snow? Maybe these are for warm climates only?

Unknown

If you lay

them flat they wont. But they also use them hanging vertically on the side of buildings because a heat pipe must have some pitch and these dont. http://sunmaxxsolar.com/sunmaxx-20-u-pipe-evacuated-tube-solar-collector.php

singh

On roof

it looks like you can still install them on any pitched roof, only header is on the side. I would think if you had a tight area the horizontal would use less space, lengthwise, width now becomes longer.

They look like the same Viessman/Thermomax tubes.

BTW, I got a mailer from Viessman, nothing on their site yet.

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hot_rod

seems a lot more prone to hail

damage mounted flat?

Vertical make sense, sometimes. Didn't a Viessmann show house have vertical tubes for a railing around the upper level?

hr