Solar Water Heaters are our main product. High quanlity with Low Price.

Solar Water Heater for House

One of the most cost-effective ways to include renewable technologies into a building is by incorporating solar hot water.

A typical residential solar water-heating system reduces the need for conventional water heating by about two-thirds. It minimizes the expense of electricity or fossil fuel to heat the water and reduces the associated environmental impacts.

Most solar water-heating systems for buildings have two main parts: a solar collector and a storage tank.

Solar Water HeaterActive Systems

Isolated pressure-enduring Solar Water Heater

In Active systems ( also known as pump systems or split systems), solar panels are installed on the roof and the storage tank is located on the ground or another convenient location that does not have to be above the solar collectors. Water (or another fluid) is pumped through the solar collectors using a small electric pump.

MORE---

According to the different heat pipes, the Active Systems Collector could be divided into four different types:

A: Common Collector---The Collector is no with heat pipes in the glass tubes

B: Copper tube heat pipe Collector---The Collector is with Copper tube heat pipes in the glass tubes

C: Copper sheet heat pipe Collector---The Collector is with Copper sheet heat pipes in the glass tubes

D: Copper U-shape heat pipe Collector---The Collector is with Copper U-shape heat pipes in the glass tubes

General speaking, the Active Systems have two popular designs.

A: Indirect system---Closed Loop circuit System

Indirect-circulation systems pump heat-transfer fluids through collectors. Heat exchangers transfer the heat from the fluid to the potable water. Some indirect systems have "overheat protection," which is a means to protect the collector and the glycol fluid from becoming super-heated when the load is low and the intensity of incoming solar radiation is high. The two most common indirect systems are:

Antifreeze. The heat transfer fluid is usually a glycol-water mixture with the glycol concentration depending on the expected minimum temperature. The glycol is usually food-grade propylene glycol because it is non-toxic.
Drainback systems, a type of indirect system, use pumps to circulate water through the collectors. The water in the collector loop drains into a reservoir tank when the pumps stop. This makes drainback systems a good choice in colder climates. Drainback systems must be carefully installed to assure that the piping always slopes downward, so that the water will completely drain from the piping. This can be difficult to achieve in some circumstances.

B: Direct system---Open Loop circuit System

Direct-circulation systems use pumps to circulate pressurized potable water directly through the collectors. These systems are appropriate in areas that do not freeze for long periods and do not have hard or acidic water. These systems are not approved by the Solar Rating & Certification Corporation (SRCC) if they use recirculation freeze protection (circulating warm tank water during freeze conditions) because that requires electrical power for the protection to be effective.

Solar Water heater Passive Systems

Integrated Solar Water Heater

In Passive systems, the tank is placed above the solar collectors so that cold water sinks into the collectors, where it is warmed by the sun, and rises into the tank. A continuous flow of water through the collectors is created without the need for pumps.

Passive solar water heaters rely on gravity and the tendency for water to naturally circulate as it is heated. Because they contain no electrical components, passive systems are generally more reliable, easier to maintain, and possibly have a longer work life than active systems.

The Passive Systems also have two popular designs.:

Integral-collector storage systems consist of one or more storage tanks placed in an insulated box with a glazed side facing the sun. These solar collectors are suited for areas where temperatures rarely go below freezing. They are also good in households with significant daytime and evening hot-water needs; but they do not work well in households with predominantly morning draws because they lose most of the collected energy overnight.
Thermosyphon systems are an economical and reliable choice, especially in new homes. These systems rely on the natural convection of warm water rising to circulate water through the collectors and to the tank (located above the collector). As water in the solar collector heats, it becomes lighter and rises naturally into the tank above. Meanwhile, the cooler water flows down the pipes to the bottom of the collector, enhancing the circulation. Some manufacturers place the storage tank in the house's attic, concealing it from view. Indirect thermosyphons (that use a glycol fluid in the collector loop) can be installed in freeze-prone climates if the piping in the unconditioned space is adequately protected. Learn more about freeze-protected piping and research being conducted at the National Renewable Energy Laboratory.