Solar Hot Water FAQ's

Using the sun to heat water is not a new technology, but many people are still unaware that such systems exist. If you are new to the concept of solar water heating or maybe know a little about it and would like to know more, continue on below to see our Solar Hot Water Frequently Asked Questions.


Solar water heaters also called solar domestic hot water systems can be a cost-effective way to generate hot water for your home. They can be used in any climate, and the fuel they use sunshine is free.


Solar water heating (SWH) is a technology that every homeowner can use to save on utility bills. In a year, the average household of four will consume enough energy heating water to fuel an intermediate-sized car for 20,000 miles.
After much trial and error over the past twenty-five years, modern systems have become not only efficient and cost effective, but also extremely reliable


A. A solar water heater uses the sun's energy to pre-heat household water before it enters your house as the amount of sun that Egypt receives, a solar water heater could generate up to 95% of your annual water heating needs.

A. Water heated by the sun can reach temperatures exceeding 212º F, but the normal temperature for household use is only 70o to 90o C.

A. Solar water heaters are divided into two kinds of systems: active or passive. Active solar systems rely upon moving mechanical parts in order to transport heat, while passive units simply use the sun to accomplish this action. The bulk of systems installed in Egypt are passive because they are considered to be more efficient and attractive. Although, most of the systems installed worldwide are passive because they are simple and need no auxiliary power (electricity) to operate

A. The collector is usually an all copper tube and fin absorber enclosed with an insulated aluminum frame or "box", covered with a low-iron tempered glass glazing. The water contained within the gas or electric water heater is circulated through the solar panels in a single-tank system, or a separate tank is used to pre-heat the water before it enters the conventional water heater in a two-tank system. A two tank system is usually considered to be the best option but if properly managed, a single tank system can provide between 50 and 80% of the household needs for hot water. The water being circulated is gradually heated and the system should be sized to provide between thirty to fifty liters of hot water per person per day. A reliable automatic control to operate the pump is essential. Fortunately, pumps and electronic controls have evolved and can be expected to provide over twenty years (and counting!) of service.

A. Passive systems can be divided into two types: Thermosiphon and Integral Collectors Storage (ICS). Passive solar systems are popular because of their inherent simplicity and reliability. The storage tank is located on the roof and heating effect of the sun causes warm water to circulate within it. Cold water from the city flows directly to the tank on the roof, and then flows to a conventional water heater located on the ground level. It is desirable to keep the distance between the solar system and ground level water heater as short as possible in order to reduce the amount of cold water sitting in the pipe between the two units. In the case of a thermosiphon system, an insulated tank will prevent the loss of stored heat during the night. The ICS or "batch" heater is the most simple kind of solar heater, but the exposure of the storage unit to night air can cause significant heat loss in winter and precludes the use of this kind of panel in all but the mildest climates.

A. Yes and No. You will actually have much more hot water than ever before. If the system is sized well for your family, you will no longer need to wait for the water heater to 'recharge' between showers. Solar water heaters are always installed in addition to your regular water heater. That means that even during bad weather you will still have hot water. To maximize your savings, you should attempt to use the most hot water in the late morning and early afternoon when the solar system is operating at its peak. Also, it helps to spread your cleaning load over the week. For example, instead of washing seven laundry loads all at once it would pay to do one a day. This will reduce the amount your regular water heater must operate.

A. Yes. Since the water heater will operate far less frequently, solar will extend its life significantly. Some water heaters that were retrofitted with solar in 1974 are still in service today, over a quarter of a century later. The life of an ordinary gas heater without solar is between five and ten years

A. The cost may vary from £8000 to £10000 It depends largely upon the following variables:
• Size of the family to be served (and therefore the amount of heat required)
• Size, type and brand of solar system
• Type of roof upon which the panels are mounted
• Orientation of panels

A. It depends upon the size of the system and the needs of your family and the way you currently heat your water. The average annual cost fo r water heating can be over half the expense of a household's entire annual gas bill, especially in those homes with teenagers or shower hogs. In an average home a person uses between thirty and fifty liters of hot water a day, which can cost £15 to £25 per person every month. A family of four could be spending between £960 to £1560 a year just for heating water. A utility bill is sometimes structured to charge for energy at varying rates or tiers, where the most costly level or tier is levied in winter, when you are using the most gas. A solar system can reduce your daily gas consumption and thus you would be purchasing the less expensive Tier 1 or "Lifeline" rates. This chopping off or shaving of the highest can have a profound affect on the cost of winter utility expense.

A. Solar heating does have a payback, and it can vary from four to ten years. But it may be more useful to think of solar as an investment that yields an annual return, much as a bank savings account provides interest. A solar water heater will generate savings that can equal a bank account generating a twenty percent (20%) annual return, and the savings are not taxed as income, as is the interest you earn at the bank. The truth is, if you want hot water… you will be paying for that heat. You may prefer to pay the utility bill forever, or you may wish instead to go solar, and become your own utility. It is quite similar to the reason you once decided to buy your home and stop renting. Solar is simply the best investment available today because it guarantees a return on money that you will otherwise "burn" and helps you develop equity as you bank your savings.

Wunder is the name of one of collector designs of Solimpeks.

TSM is a general name of thermosiphon systems of Solimpeks which work the opposite way of traditional thermosiphon systems. Solimpeks is the pioneer on that hygienic thermosiphon idea.

No collector maintenance is required. There are no moving parts to wear out. All components are made from high-grade aluminium, copper or non-corrosive materials.

The useful life of the collectors is predicted to be 30 years or more.

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