Xianke FAQ
Solar Water Heater FAQ
Trade Term FAQ
What are the reasons for plumbing problem?How to deal with it?
What are the reasons for plumbing problem?How to deal with it?
What are the reasons for plumbing problem?How to deal with it?


How to maintain solar water heater

1. Whether it is a flat plate collector or a vacuum tube collector, the solar energy is obtained through the effective lighting area. Therefore, under the same large collector outer ring area, the larger the effective lighting area, the solar energy obtained The more, the less.2. The effective hot water volume of solar water heater refers to how much effective hot water can be obtained by solar system every day, and the hot water can be released and used. It is called effective hot water. The hot water that cannot be released is invalid. The effective hot water volume of the system is also very different. The effective hot water volume of the flat system board is greater than that of the vacuum tube system.3. Flat solar water heaters work outdoors, withstand the sun, wind, rain, etc., the operating environment is relatively harsh. If you can pay attention to it when you use it, clever arrangement and use of the time and amount of water supply will effectively increase the efficiency of the water heater, and will achieve a multiplier effect.4. If it can be properly maintained, it can also effectively extend the life of the water heater. After the water heater is installed and fixed, non-professionals should not easily move or unload it to avoid damage to key components. No debris should be placed around the water heater to eliminate the hidden danger of hitting the vacuum tube. Regularly check the vent holes to ensure smooth flow, so as not to swell or deflate the water tank.

Can the water in the solar water heater be drinkable?

The inner tank of the solar water heater tank is made of food-grade SUS304 stainless steel, and the seals on the inner tank of the tank are all silicone, non-toxic and odorless, which has no effect on the water quality, but the water in the vacuum tube cannot be completely discharged every day. Breeding bacteria, so it is recommended that you do not eat the water in solar water heaters.

Can solar water heater work in winter?

Yes,Winter can be used, solar water heaters play a big role in the winter. But pay attention to the temperature is too low, the water pipe is cracked. Although the temperature in winter is relatively low, if we use it normally and ensure that the water in the water heater is flowing, then it will not crack.

Passive Solar Water Heating Systems

Passive solar water heating systems are popular because of their inherent simplicity and reliability, no pumps or controllers or wiring.The storage tank is located on the roof and cold water from the city or well flows directly to the collector on the roof, where it is heated and then flows to your conventional 40 or 60 gallon water heater located on the ground level, and you have storage of hot water in your tank overnight. If you have large morning draws of hot water (ie: showers or baths) most of the collected heat energy returning to your tank is lost overnight, thereby saving you 50-60% of your long term hot water energy costs, compared with close to 85% savings with an Active Open Loop Solar Water Heating System.In the case of a thermosyphon system, an insulated tank on the roof, located above the collector will lower the loss of stored heat during the night, but is not aesthetically appealing. These types are more popular in the islands.

Where is the solar water heater used?

It is used in holtels,schools,hospitals,bath centers,natatoriums,enterprise units,farms,clean centers,household,etc.

Does a tankless water heater save more money than a solar water heater?

Savings of 20% on tankless versus up to 85% savings on a solar water heating, is the reality behind your electric bill savings, however the convenience factor of instant hot water is the overriding benefit of a tankless water heating system.  Here is why:The water you use still has to be heated: The amount of energy required to heat a gallon of water to a specific temperature does not change just because it is being heated at a faster rate.A tankless water heater only eliminates energy costs for maintaining the temperature of water that has already been heated and is sitting in the storage tank awaiting use. Standby losses of (approx 5 minutes out of an hour)So a tankless water heater is saving about 15 to 20% percent of water heating costs compared with solar at 85% savings over a conventional tank type electric or gas water heater.And tankless water heaters do have drawbacks. According to the U.S. Department of Energy, “Sometimes … even the largest, gas-fired model cannot supply enough hot water for simultaneous, multiple uses … taking a shower and running the dishwasher at the same time can stretch a (tankless) water heater to its limit.”Naturally, you can overcome this problem by installing multiple tankless water heaters. On the other hand, the total installation cost for more than one tankless water heater easily approaches the cost of a single solar water heating system.  Additionally, Solar water heating systems useful life is over 30 years.

How is the solar hot water system protected in freezing weather?

In both direct and indirect systems, automatic recirculation is used for freeze protection. When the water in the collector (panel) reaches a temperature near freezing, the controller turns the pump on for a few minutes to warm the collector with water from the tank and repeats until temperatures are above freezing.In addition there is a freeze protection valve located at the collector, when the copper piping connected to it reaches 45 degrees, it opens allowing a small amount of water to trickle out of the collector (panel) and simply runs off the roof.A third option (not necessary) allows you to manually drain the collector (panel) of approx. 3 gallons of water if you so choose. Ask us more and we advise you.Collectors are basically of 3 types namely Flat Plate Collectors, Evacuated tube, and Passive, thermosyphon. Solar Flat Plate collectors are the most widely used collectors for Water Heating systems because of their Simplicity in design, easy operation and Installation & they return the highest payback per dollar invested.

Your company is the manufacturer? Trader? Procurement Office? Distributor? Agents?

We are the manufacturer of solar water heater.

How does solar hot water heater work during winter conditions?

Many regions seldom experience freezing temperatures while others deal with them much of the year. Chances are, if you live in climate where the temperatures drop below freezing frequently, the solar heater you purchased and installed is already geared to handle the changing conditions.Many of the regions that experience the coldest temperatures don’t lack sunlight during the winter, so ensuring that your solar hot water heaters functions year round is mainly an issue of freeze prevention.First, the pipes, or as little as possible of them, should not be exposed. This is not as necessary if you operate a closed loop system with antifreeze. However, some closed loop systems circulate water as the heat transfer liquid which could freeze even during the day.Closed loop systems pump a heat transfer liquid such as antifreeze into the solar collector. This liquid is heated by the sun and then pumped back to the storage tank where a heat exchange transfers the heat energy to potable water. Antifreeze will not fail during cold weather conditions, but you before the onset of winter you should check the amount of it. Any failure of the system during the winter could deprive your home of hot water.water automatically drains out of the collector when there is no sunlight and no further water is pumped into it, drain back systems have a built-in freeze protection. If temperatures are below freezing even when the sun is out, drain back systems could still be at risk of freezing.

Supports for Solar Collector Array

Provide support structure for the collector array of  aluminum, stainless steel, or other corrosion-resistant approved material .  Furnish a support structure which secures the collector array at the proper tilt angle with respect to horizontal and orientation with respect to true south.  Consideration should be made to mounting collectors parallel to the pitched roofs.  The collector tilt angle may vary by +/- 25 degrees, and the azimuthal angle may vary by +/-45% from the optimal tilt and azimuth.  Provide a support structure that will withstand the static weight of filled collectors and piping, wind, seismic, and other anticipated loads without damage.  For heavy  systems, such as integral storage collectors, provide structural reinforcement for the roof across at least four rafters and provide verification that the structural modifications proposed are satisfactory.  Provide a support structure which allows access to all equipment for maintenance, repair, and replacement.  Neoprene or EPDM washers shall separate all dissimilar metals.  Depending on system type, supports for solar array could terminate in ballast blocks to avoid roof penetrations.

Solar preheat storage tank

Provide a cylindrical thermal energy storage solar preheat tank with a storage capacity of at least 1.5 gallons per square foot of collector area.  Insulate each tank with fiberglass or foam with a loss coefficient of not more than 0.5 W/m2C.  Protect the insulation by a PVC or steel jacket.  Provide a tank rated at 100 lb/in2 at 190 degrees Fahrenheit.  Provide the interior of each tank with glass lining for potable service. 


1.PIPING SYSTEMProvide a piping system complete with pipe, pipe fittings, valves, strainers, expansion loops, pipe hangers, inserts, supports, anchors, guides, sleeves, and accessories with this specification and the drawings.  Pipe shall be designed to observe limits on flow velocity, pressure drop, and gauge pressure associated with the pipe type and characteristics.  Provide, install and test the piping. Provide piping flow rates below 5 feet per second.  Piping shall be Type L or Type M copper tubing, ASTM B-88, with 95-5 tin-antimony soldered joints.  If cold water piping supplying the SWH system is of another type, such as PVC, it shall be replaced within 10 feet of the SWH system with  copper to avoid bulging and rupture due to proximity to the higher temperatures of the solar system.   2.Pipe InsulationFurnish interior pipe insulation and coverings such as Armaflex, Insul-Tube, Rubatex, or approved equivalent.  Provide outside array piping insulation with a capability of withstanding 250 degrees F, except that piping insulation within 1.5 feet of collector connections shall be capable of withstanding 400 degrees F.  Protect outside piping insulation from water damage and ultraviolet degradation with a suitable outer coating manufactured for this purpose (aluminum, sunlight resistant PVC or approved equal).  3. Calibrating Balancing Valves (for multiple collector banks)If systems are proposed with multiple collector banks, provide calibrated balancing valves suitable for 125 psig and 250 degrees F service.  Furnish calibrated balancing valves with bronze body/brass ball construction with seat rings compatible with system fluid and differential readout ports across valve seat area.  Provide readout ports fitted with internal insert of compatible material and check valve.  Provide calibrated balancing valves with a memory stop feature to allow valve to be closed for service and reopened to set point without disturbing balance position, and with a calibrated nameplate to assure specific valve settings.  Provide calibrated balancing valves and ball valves at the outlet of each collector bank.  The balancing valves are specified to allow the array to be flow balanced.  The ball valves are required to enable the array to be disconnected for maintenance or repair.  This requirement for balancing valves is not applicable to systems of only one collector bank, where balance of flow is not an issue.4.Pressure GaugesProvide pressure gauges with throttling type needle valve or a pulsation dampener and shutoff valve.  Furnish a 3-1/2 inch minimum dial size.5. ThermometersSupply thermometers with wells and separable bronze sockets.6.Pipe Hangers and SupportsSupport and hang piping so that the weight of the piping is not supported by drywall , siding, or other building members not designed to bear load.  Support piping so that thermal expansion and contraction of pipe lengths is accommodated.  7.ValvesProvide valves compatible with the piping.  Ball valves shall be used for shutoff, with full port, bronze body, bronze ball and teflon seat.  Bronze hose-end gate valves shall be used for draining low points of piping.8.NameplatesSecure to each major item of equipment the manufacturer's name, address, type or style, model or serial number, and catalog number on a plate.

Solar home water heater performance requirements

Solar water heating systems must be safe, reliable, require no operator intervention for normal operation, be visually unobtrusive, and be designed and installed in accordance with all applicable codes.  Design and size the system so that solar energy supplies approximately the percent of the annualized hot water demand (“Required Solar Fraction”) specified in Table 1, below.   Table 1:  Percent of annualized hot water demand to be met by solar hot water heating system in each location covered in this solicitation:BuildingLocationRequired Solar FractionGallons per Day DemandHot Water Delivery TemperatureAvg. Main Water Temperature (F)  75%                 

Solar water heater Design Requirements

Design, furnish and install new solar water heating (SHW) systems for the heating of domestic water.   The solar water heating system offsets the use of natural gas, propane or electricity  by preheating water before the conventional domestic hot water system.  System types incorporating both freeze-protection and overheat protection are required.  Freeze protection is not required if climate is non-freezing, but overheat protection required in all systems.  Supplied equipment must be rated and warranted to withstand and operate under lowest-record-low and highest-record-high temperature for the location.  It is often the intent to use the system  for educational purposes related to the benefits and use of renewable energy, so appearance and quality are considerations in design decisions.Solar collectors are to be mounted on the roof or on the ground as suitable for the type of SHW system and needs and limitation of the building and site.  System must be of a type suitable to the climate of the site.  For systems proposed not under passive control, control each system by a simple differential temperature controller.  Provide a separate solar water heating system for each building unit designated.  Each of the solar systems is to incorporate the existing electric water heating system as its auxiliary subsystem.  In the event that the existing electric water heater is in need of repair or replacement, the contractor may propose to repair or replace the electric water heater under the scope of this project. Include with each system, components that consist of a solar collector array, array support structure, storage tank, interconnecting piping and fittings, tempering mixing valve, flush-and-fill valves, pressure relief valves,and as required by the system type, any necessary pumps, controls or heat exchangers, as well as all other accessories and equipment required for the proper operation of the solar system.Include with system all labor, supervision, equipment inside and outside the building, tools, materials and incidentals necessary to design, procure, install, checkout and place into operation a complete solar water heating system ready for use for the building.