1.      Can a solar water heating system fully replace traditional electrical gas or electric heating system?

A solar water heating system could be able to fully in place of traditional electrical gas or electric heating system. However, with regard to solar fraction and best return on investment, we suggest using solar water heating system with conjunction with traditional electrical gas or electric heating system.

2.      Can solar water heating system be used in winter?

Yes, it is. Solar thermal collectors used by E&J group can produce heat during winter months since anti-freeze working fluid in collectors can work under zero degree.

3.      Can solar water heating system be used in cloudy and freeze weather?

Yes, solar water heating system can be used in cloudy and freeze weather. In cloudy weather, output of solar thermal collectors would be less than sunny day, but traditional energy could be used for guaranteeing certain quantity of hot water supply and maintaining at certain temperature. In freeze weather, our customers don’t need to worry about that working fluid would be frozen. Glycol is normally used as working fluid in our solar thermal collectors. The property of glycol is shown below:

4.      Can solar water heating system be used with existing hot water system?

It normally can be used with existing hot water system. Simple retrofit valves are usually used to allow solar water heating system to connect to existing cold water inlet. We may install a additional water storage tank If your tank cannot accept the solar input directly.

5.      Can Solar water heating system heat water up to high enough temperature?

Solar thermal collectors used by E&J group Inc can heat water up to 80 degree.

6.      What are the advantages of solar evacuated collectors?

·         Solar evacuated tubes are able to passively track sun light, so it can accept sun radiation as much as possible.

·         There is vacuum in the tubes, which largely reduces conduction and convection from the interior of the tubes.

·         Evacuated tubes are strong, long lasting, inexpensive, and if one tube is broken, a new will be easily fixed.

·         Solar tubes are able to heat water all year around since it has high efficiency in absorbing solar radiation, and well insulative properties.

7.      What is life of solar thermal heaters?

Around 20 years, but manufactures normally guarantee 10 years.

8.      What is the payback of solar thermal systems?

There is no certain answer for the questions. It is determined by geographic location, numbers of solar collectors used, government incentives, and isolation degree.

9.      Is installation of solar hot water system a worthy investment?

Solar hot water system absorbs solar power to heat water up to certain temperature. It usually takes several thousands in initial installation and annual maintenance, which won’t cost high. Year of payback is determined by specific condition of each client. After breakeven point reached, clients can get pure benefits from the system, and there is no more energy cost for water heating. In addition, government incentives can help compensate some initial installation cost.

10.  What is size of the system customer would like to choose?

E&J Group Inc., can determine the size of your system based on your energy bill, how much you would like to spend and how much solar fraction you would like to obtain.

11.  Does Solar heating system need annual maintenance?

Maintenance is necessary, but not annually. Instead, an annual assessment is recommended, which is helpful for maintaining efficiency of your solar thermal collectors.

12.  How to fix solar collectors on the roofs?