FAQ – Frequently Asked Questions

We are happy to support you with questions about our products.


Is there any warranty on your products?

Yes, the product Virtu has a 10-year warranty on the thermal component, and even 20 years on the electrical component. The product Bluedec has a quality guarantee by means of the obtained ISO certifications and the highest fire class (A1).

How come there is a difference between the warranty on the electrical and thermal part of Virtu, it is one and the same tube?

This has to do with certifications that have been issued. We understand the confusion, it is indeed one tube. In terms of product quality and service, we strive for maximum results, even after the stated warranty period.

I miss a calculation model on your site. How do I know how many tubes I need and what this will cost my organization?

We have various calculation models which we use internally. The reason that we do not place a simplified calculation model (as with PV panels) is because we want to offer tailored solutions. We therefore cannot determine with a standard formula how many Virtu tubes your building or site needs. This depends on several factors and variables. We strive for the most profitable result for you.

As a private individual I am interested in your Virtu tubes. Do you also supply to individual households?

We can deliver to private individuals, although that is not our focus. The reason for this is that the return on investment (ROI) and the efficiency of the tubes will only become interesting with a certain number of tubes, which will be above the average capacity of a home.
Larger homes with assets such as underfloor heating, a swimming pool, etc. can be interesting.
If the entire street or residential area is connected to Virtu, it is also profitable, ask your municipality about this option.

Will the tubes be noticeable on the roof?

The tubes are low-profile, with an installed height of only 25 cm. They are generally invisible from the ground if mounted on a flat roof, and don’t require A-frames. In many cases, this eliminates the need of complicated planning permissions.​

Why should I install one hybrid collector when I could install two separate conventional ones (1 PV + 1 thermal)?​

For many reasons! For instance, you would pay for half of the installation costs, effort, time and roof space, on top of more energy generation.​

What material is the Virtu tube made of? Are there any toxic substances?

The Virtu tube is completely vacuum. Various materials are used, including tempered glass, copper and a mixture of water and glycol. There are no foreign gases or substances in the tube.
The environmentally friendly aspect has been taken into account in the design and production. The tube will not leak or cause contamination if used and installed in accordance with the instructions. Appropriate maintenance and monitoring are part of this.

I think it is important that the production of the Virtu tubes does not have a harmful effect on the environment. Has this been taken into account?

Yes, the Virtu tube is unique in its production. The emissions have already paid for themselves after six months of a working Virtu tube.

What are the dimensions and weight of the Virtu tube?

The Virtu tube is 1.99m (78.35 inch) in length, 25cm (9.84 inch) high (including base) and has a diameter of 18cm (7,09 inch). A Virtu tube weighs 15 kg (33 pounds) empty and 16 kg (35 pounds) full.

What is the output of the Virtu tube?

The output of a HOT tube is 370W / p thermal. The output of a PVT tube 270W / p thermal and 70W / p electrical.

What temperatures do you supply with the Virtu tubes?

We usually deliver between 30 and 100 degrees Celsius (86 – 212 Fahrenheit), where PVT generally goes up to 80 degrees Celcius and HOT up to 100 degrees Celcius. The boundary on the PVT tube is slightly lower than on the HOT tube. The maximum for PVT is at 140 degrees Celsius (284 F) and for HOT at 160 degrees Celsius (320 F). Above those temperatures, damage occurs over time.

I want to make my building completely energy neutral. Is this possible with Virtu?

Yes, this is possible and depends on your wishes. E.g. whether you need cooling or not. We do mention that Virtu can achieve an energy-neutral level of 80%, but that the last 20% require relatively more tubes than the first 80%. It depends on your wishes and objectives whether or not you want to go for 100%. Of course we can facilitate this, provided there is sufficient space available.

How is it possible that my building can also be cooled with the same product in addition to heating? Do I not need a separate installation or air conditioning for this?

The residual heat that is released at the output of the Virtu tube can be used and led to a Supro Cooling machine. This happens through adsorption or absorption by converting heat into cooling. No F-gases are released during this process. As a result, the cooling is energy neutral in addition to the heat generated and complies with all modern regulations.

I don’t have enough space on my roof and I also have skylights on my building. Will I still be eligible for Virtu?

The Virtu tube has the unique feature that it can also be mounted on facades. This has a limited effect on the output, depending on the location / direction of the available facade. We have interesting use cases available for this.

Will I offset more carbon with Virtu than other products?​

Absolutely. Virtu has a market-leading peak efficiency of up to 80% (20% PV + 60% thermal), displacing more fossil fuels than other distributed energy solutions. By generating both clean electricity and heat, Virtu will dramatically reduce your Scope 1 and 2 emissions.​

How much maintenance is needed? ​

Our product does not require more maintenance than alternative solar systems. Virtu combines high quality of the product, trusted partners, and strict methodologies. The performance is monitored digitally and in real-time. 20-year lifetime can be expected from well-maintained systems.

Can Virtu be combined with heat pumps?​ ​

Yes, Virtu can be combined with ground- and air-source heat pumps to increase their efficiency.

What role do the weather conditions have on the Virtu tubes, do I have to take anything into account?

The Virtu tubes have a special and tested design. Wind, storm and rainfall have no effect and pass by without shifting the tube. However, we do recommend clearing the tubes after heavy snowfall, for example with a leaf blower.

I’m considering both traditional PV panels and Virtu. What do I have to take into account?

We only recommend our Virtu product if you also need heat in addition to electricity. A PV panel only generates electricity. This may be a better solution for electricity alone. However, take into account stricter regulations for heating and possibly cooling could be relevant your building. You cannot facilitate this autonomously with a PV panel. In addition, the Virtu tubes need a smaller surface to achieve more output than the PV panels. This has to do with the design and the efficient placement of the tubes.

I would like to use my own installation provider for the installation of the Virtu tubes. Is this possible?

Yes, this is possible. We do need to be in contact with this party. Knowledge transfer in terms of technology and installation of the Virtu tubes is important here.

Which variables do I have to share to get a good estimation of the required Virtu tubes?

We use a standard questionnaire in advance. You can find it here.

What materials are needed to attach the Virtu tubes to my roof?

The Virtu tube can easily be placed without additional materials on a flat roof. The design has been developed in such a way that it does not shift or blow away during storms etc. On a pitched roof additional materials are required.

Where can I see use cases and possibly check a live Virtu installation?

There are several use cases on our website. You can review these and if desired an appointment can be made to view a live Virtu installation.

I am interested in selling your products. Is there a possibility for this?

We already work with several resellers and are open to more collaborations. Please contact us to discuss the options further.


I have a cornered roof with PV panels, can I use the product Bluedec for my roof?

Yes, this is possible. To do this, we analyze how many m2 of Bluedec your roof needs. One of the unique aspects of Bluedec is its flexibility, which makes it easy to lay it on different surfaces.

I cannot get my building insured or it won’t get extended because of my PV installation. How do I know if Bluedec is solving my problem?

We advise you to contact your insurer. State to them that Bluedec has fire class A1. We also contact them for you if necessary. Most insurers are aware of the high-quality fire-resistant aspects of Bluedec.

What is the shelf life of the Bluedec product?

Bluedec lasts a lifetime and in principle does not need to be replaced!

Is the Bluedec product water and UV resistant?

Yes, Bluedec is completely water and UV resistant.

What is the weight of the Bluedec product?

Bluedec weighs 150 grams (5,29 ounce) per m2.

How do I attach Bluedec to my roof?

Attachment of Bluedec is done by means of a bituminous glue. This adheres to bitumen at a cellular level, but attaches also very well to other surfaces.

What is the width of the Bluedec product?

We supply two variants, one of 30cm (11,81 inch) and one of 60cm (23,62 inch). The 30cm version is wide enough for PV panels and a junction box. If there is a desire to also provide the cable tray, we recommend the 60cm variant, in the case of wider cable trays

Can I walk on the Bluedec product without damaging it?

Although we do not encourage to repeatedly walk on Bluedec without purpose, the product itself is able to resist the pressure. It should always remain well-possible to walk on the roof.