For this reason evacuated tubes are the ideal choice for high temperature hot water applications or locations that get cold in the winter.In order to help maintain the vacuum over the 15-20 year life of the evacuated tube, a barium getter "soaks up" any remaining gases in the evacuated chamber plus any fresh gases such as Nitrogen that can slowly permeate through the glass over time, a process known as out-gassing.All videos are hosted by 3rd party websites and therefore we have no control over the content of these websites.
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To confirm the strength of the tubes, each batch of evacuated tubes assembled in the Apricus factory have randomly selected samples tested by dropping a 30mm / 1.2" diameter steel ball onto the tube from various heights. The name "evacuated" is used to describe the process that expels the air from within the space between the tube tubes, forming a vacuum.
A vacuum is an excellent insulator against heat loss, and so evacuated tubes are able to operate very efficiently when there is a big difference between the inside of the tube and the outside ambient air.
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Some tubes have a single walled tube with a metal to glass seal at the top.
Apricus uses the twin wall "all glass" design as it is has been mass produced for more than 15 years and is extremely reliable and efficient.
This barium layer also provides a clear visual indication of the vacuum status; the silver-coloured barium layer turns white if the vacuum is lost making it easy to identify a fault tube.