Evacuated refers to vacuum-sealed. Learn about evacuated solar tubes, a heat-generating technology developed for northern European regions. Evacuated tubes work due to the sun's short-wave radiation converting to long-wave radiation. Installing this solar energy system will enhance your heating capabilities and bring it up to modern standards.
"The solar tubes you recommended are very efficient as we are only having to top up our system with the gas heater for about an hour a day, even though the weather has been very wet to date."
Mr. Greenough, Denbigh.
The best solar tube technology includes a patented Low E glass. These use a unique 'low-iron' glass formula that has reduced reflective properties and increased absorption. The glass surface has 360 degrees absorption ability to offer better performance than flat-plate technologies. The reason is heat retention and production at lower outdoor temperatures. Each tube is just like a thermos flask. Once the heat is in, it becomes trapped.
The science bit.
A popular solar technology before the advent of PV solar systems:
How do evacuated tubes work in the UK climate?
The UK receives 60% of the sun's radiation compared with the equator. Each square metre receive 900 to 1,300 kWh annually. All can be captured and diverted into your hot water tank with evacuated tubes. Evacuated tubes use a thermos flask principle that allows each vacuum tube to get hot regardless of external air temperature:
What about Combi boilers?
Combi boilers aren't possible in most cases. We would need to re-install a hot water tank. Most homes with Combi's won't have the space to install a hot water tank.
Can I install evacuated tubes myself?
Yes, it is possible to self-install a DIY solar kit or work with a local tradesperson.
Is there a danger that it could get too hot?
The system may never rise above 85° Celcius.
Why update my hot water tank?
Older 'copper' hot water tanks run exceptionally inefficiently, especially after many years of use. Limescale will reduce performance even further. When installing evacuated tubes, it's essential to establish an efficient tank to get the most out of your system.
Will it contribute to my central heating?
We would need to check your management system is suitable. In most cases, evacuated tubes can contribute to your central heating via underfloor heating. Evacuated tubes are the most efficient solar heating technology, but PV-heating converters could be an option.
How long will it take to install?
Most installations can be complete in one to two days.
Do I require planning permission?
Listed buildings, conservation area homes, national parks may require permission. Please consult with your local planning officer.
Do evacuated tubes work on cloudy days?
This question depends on the density of the cloud. In average cloud density, solar panels use passive energy. With dense cloud cover, probably not.
Can you upgrade my hot-water tank?
In most cases, we recommend updating the hot water tank to allow a secondary connection and improved insulation for an evacuated tube installation.
How long do evacuated tubes last?
A system will easily last twenty-five years.
Length: 1642mm x Width: 1392mm x Height: 102mm.
Aperture Area: 2.0 m2.
Max Power 1236 W.
Length: 1642mm x Width: 2082mm x Height: 102mm.
Aperture Area: 3.0 m2.
Max Power: 1858 W.
An alternative to traditional solar heating is the PV-to-heat converter.
"I've witnessed many fantastic changes, innovations, and aftermarket products arrive on the scene. My fellowship with ethically-minded MCS solar panel installers goes back decades. Today, I offer my experience to help adopters discover the best."
Power My Home Solar Panels UK
Sundial House, 44 Panton Road, Chester CH2 3HX.