What is Evacuated tube? As far as we know, vacuum tube is one of the important roles of solar water heaters. Its main material is glass. Derivative work products include vacuum tube solar collectors, heat pipes and solar panels.We provide the right price for your reference.China solar vacuum tube price supplier!

hot water evacuated tube
hot water evacuated tube

What is evacuated tube collector?

Evacuated tube collector. Evacuated tube creditors are flat devises which encompass cylindrical absorbing surfaces or tubes with internal fins hooked up in an evacuated tube to lessen the convection losses. A vacuum tube collector (ETC) consists of a single tube connected to the manifold.

  • ESCOO vacuum tube solar collector converts sunlight into heat. The circulating pump moves the liquid through the collector, bringing heat back to the solar tank.
  • Water in solar tanks is gradually heated either directly or through heat exchangers.
  • When using hot water, the solar preheated water is fed into the traditional water heater. If the water heater is not hot enough, it will raise the temperature.
  • A vacuum tube sealed in plastic or glass, used to collect blood samples obtained through a venipentesis.

How do vacuum tubes work?

The principle of a solar vacuum tube is simple. The absorbed solar radiation is then transferred to a heat transfer fluid (the liquid in the thermos) inside the tube, which is rapidly heated and rises to the top. In an open vacuum tube system, drinking water is heated directly in the vacuum tube.

The ESCOO 35 vacuum tube solar collector is designed to efficiently provide hot water for many applications in the U.S. and around the world for climate and region.

working principle

While the evacuated solar tube is exposed to the sun, it absorbs the warmth. the warmth tube placed within the evacuated glass tube gets hotter, and the liquid (alcohol, acetone) within the heat tube fast turns to hot vapor.

The steam or warm vapor rises to the top of the warmth pipe. cold water or glycol that flows via the manifold and selections up the warmth.

The fluid inside the warmth pipe gets colder and evacuated tube solar panels condenses (becomes the liquid) and goes all the way down to the bottom of the heat pipe. The cycle starts offevolved all once more and continues till sun tube device has enough sunlight or diffuse mild. recommended tilt perspective must be maintained.


  1. High absorption when using the vacuum and special absorption film.
  2. Can operate in colder climates.
  3. Works great in overcast or diffuse sunlight conditions.
  4. An evacuated solar tube doesn’t need maintenance.
  5. Broken tubes can be easily replaced.
  6. It is built to last.
  7. The evacuated solar tube system provides a free solar water heating,
  8. reducing your utility bills significantly.
  9. This solar water heater provides an easy DIY installation.
  10. High efficiency as the heat is transferred only one way.
  11. High transfer rate with the use of copper tubes.


MODEL NOTUBE SIZEQTY (PCSSuitable for tank( Capacity )
ES58/1800-1258mm*1800mm12100Liter or 120Liter
ES58/1800-15, 2pcs58mm*1800mm30300Liter


40HQ’ pcs

Model SpecificationPacking count(pieces)Package Size(CM)Packing CBMCartonsTubes


China Shanghai Port Container Shipment

How much does evacuated tube price ?

Evacuated tube solar collectors are the most cost-effective collectors on the market – they provide the best performance at the most favorable price – the highest value you can get! Escoo solar evacuated tube solar collectors outperform all major competitors and cost hundreds of dollars less. solar tube price range from $50 to $120.For enterprise only pricing, quantity discounts and free shipping.ESCOO apparently does this by offering quality products at affordable evacuated tube collector price.

4 Type of evacuated tube

Detailed guide

  • Use Copper Header

The header is crafted from copper which makes for awesome warmness switch and is corrosion resistant and allows all connections to be brazed instead of soldered.

It uses “dry” plug-in warmness pipes that means that the connections are plug-and-play which makes installation or replacement quite simple.

via comparison, different evacuated tube structures that require the manifold be opened for set up or alternative that’s time eating and can purpose burns to the installers arms on a sunny day.

Copper Header
Copper Header
  • Use Heat Pipes

a few evacuated tube systems are what is known as a U-Tube, which means that the glycol solution enters and exist each tube in place of flowing throughout a manifold. The evacuated tube gadget uses what is referred to as a warmness pipe.

A warmness pipe allows for speedy warmth transfer. the heat pipe itself is a copper tube that keeps a vacuum and carries a small quantity of liquid.

The low pressure (vacuum) in the copper pipes method that the liquid boils at a low temperature (approximately 30 ⁰C / 86 ⁰F), turning to steam and dashing up to the heat of the heat pipe, carrying warmness. It dumps the heat (to the glycol solution running thru the header), condenses and runs back down to copy the manner.

The warmth pipes are made from Oxygen free copper of a completely high purity, that is essential to ensure the long term toughness of the warmth pipe.

everyday water pipe copper (as used for the header) isn’t always suitable for the warmth pipe due to the fact over time oxygen and different hint element leach out, forming an air pocket inside the top of the heat pipe.

Heat Pipes
Heat Pipes
  • Use Evacuated Tubes

The tubes are crafted from low emissivity borosilicate glass (glass with a completely low iron content that has advanced durability and heat resistance ) with an all-glass seal and that they rent AL/N on AL selective coating, which permits the usage of the entire solar power spectrum to generate warmth.

This produces more thermal performance in shiny sunshine but additionally produces excessive efficiency in overcast or diffuse daylight situations. in addition, the tubes are evacuated and feature a barium getter (vacuum indicator) which changes color from silver to white if a tube’s vacuum has been compromised.

An examination of the tubes shows that the outdoor is in reality 2 layers of glass and a vacuum has been created between them.

an excellent manner to illustrate this will be to fill an empty tube with very warm water and note that it does now not even get warm as you maintain the tube for your hands. this is because of the “thermos effect” created with the aid of having a vacuum between the layers of glass.

Evacuated Tubes
Evacuated Tubes
  • Use Aluminum Manifold

The manifold makes use of a powder-coated all-aluminum casing for sturdiness, structural integrity and light weight.

The light weight is vital for ease of set up and to lessen total roof loading in large installations which can in some instances include as much as a hundred and fifty creditors.

The manifold is full of glass wool insulation and is sealed with unique UV stabilized silicone rubber which can withstand temperatures of up to 482 degrees F.

Aluminum Manifold
Aluminum Manifold

What is the cost and durability of vacuum tube collectors?

The cost of evacuated tube creditors can be significantly greater than flat plate collectors – although the additional up-the front value can be made up for in application invoice financial savings. due to the fact flat plate creditors are typically greater price-effective for residential solar water heating systems, solar hot water evacuated tube collectors are more normally used for commercial applications.

in spite of these issues, the tubes may be changed personally without having to replace the complete collector.

preservation of evacuated tube collectors is slightly more complicated than for other styles of collectors. it is authentic that an evacuated tube solar water heater may be without difficulty wiped clean by way of falling rain water. but snow tends to melt extra slowly off those collectors, and due to the fragility of the glass, it can not be removed with a snow rake. accordingly the practicality of cleaning the sun collector can vary depending on weather.

How efficient is the vacuum tube collector?

An evacuated tube collector can work properly in cloudy situations and in temperatures as little as -forty°F. This function is maximum tremendous in less warm climates, evacuated tubes for sale or during the iciness, where other sun creditors won’t produce as much power. The cylindrical shape also allows the collector to trap floor reflected radiation, referred to as the “passive monitoring impact,” when facing genuine south.

The vacuum is a very effective insulator that maintains the water within the collector warm whilst the real tubes are only some stages warmer than ambient air temperature. solar tube cleaning This low warmth loss makes these the most efficient of all solar thermal creditors.

though, a much less green collector (inclusive of a flat plate collector) is regularly enough for a residential hot water heating device in warmer climates, as the added sun radiation makes up for any efficiency loss. however the higher performance makes an evacuated tube machine finest whilst collector space is limited.

Vacuum tube application scenarios

  • Spa and Hot Tub heating
  • Industrial SHW Systems
  • Municipal SHW Systems
  • Agricultural SHW Systems
  • Domestic Hot Water
  • Radiant Floor/Space Heating
  • Solar Pool

Other considerations

Evacuated-tube collectors can get particularly warm, exceeding the boiling factor of water and can purpose extensive issues in an present home solar water machine. You need to apply your hot water each day to make sure the temperature would not overheat within the tanks. Mixers are effortlessly mounted just after the closing hot water tank and blend your everyday (cool) water supply with the new water, to ensure the temperature in no way exceeds a fixed limit.

this tank should exceed the temperature and strain ranges, blowing hot water onto the garden and killing the grass. The black pipe became added to soundly take the new water away to the drainage system. On a floor installed panel, you can also cover the unit earlier than leaving the residence for an extended length. Be cautious of the tubes whilst overlaying them, as they’re manufactured from annealed glass, that’s greater delicate than tempered glass. You need to don’t forget overhangs (slide ice and snow masses), falling branches, and so on., while deciding on a place to your panels.

Evacuated-tube collectors don’t heat up like flat-plate creditors. for that reason in the iciness, they won’t melt big portions of snow that fall on them at one time. it can be very hard to clear the snow from the glass tubes with out breakage, be cautious. Of path, heat-pipe evacuated tubes will no longer effect the device if they spoil – you simply have one less tube to heat the water. If a right away-float tube breaks, you’ve got a trouble!

How do evacuated tubes work YouTube guide

How many vacuum tubes do I need?

If you use a “evacuated tubes” collector, you may need between 20 and 30 arrays of tubes to meet your home’s hot water needs.

Vacuum tubes are absorbers for solar water heaters. They absorb solar energy and convert it into heat, which is used to heat water. The pump has been used in Germany, Canada, China and the United Kingdom for many years. There are several types of solar vacuum tubes in the solar energy industry.

How long do evacuated tubes last?

The inner tube is coated with heat absorbent. The life of the vacuum varies from 5 to 15 years depending on the collector. In sunny conditions, flat collectors are usually more efficient than ETC

How much heat does a vacuum tube produce?

Some vacuum tubes can reach 298°C, while the outside of the tube remains cold. The vacuum in the evacuated tube also has the advantage of enabling the tube to function no matter how high the external temperature is.

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