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　　The solar-powered water heater profession passed through ten years development, the technology already quite maturely, but the generally purchase quite was also strange to the solar-powered water heater, mostly was the first purchase, how under did we on select and purchase the solar-powered water heater to make some brief introductions, in order to the purchase purchase to the genuine goods at reasonable prices, Materially beneficial product.The purchase solar-powered water heater mainly should be clear about following several points:

　　First, equipment shaping

　　First should be clear about the user constant population, average per person with the hot water volume, then figures out a day-long hot water total quantity, again produces hot water ability Faccording to the hot water total quantity as well as the 1m2 solar energy collection heat (75-90kg/Day / m2), design solar energy collection heat area S (m2) as well as heat preservation water tank capacity V (m3). Below according to us at Guangdong area many years specialized experience, the user average per person may refer to the parameter with 50 ℃ hot water volume:

　　1. families users: The flower sprinkles sprays water used 50-90kg/The human/day, or/person disposes 1m2 the solar energy collection heat 1m2 area;

　　2. factories staffs, the school hold raises the type water used: 15-30kg/Human/day;

　　3. factories staffs, the school flower sprinkle sprays the type water used: 40-60kg/Human /day;

　　4. boarding house, the hospital flowers sprinkle spray the type water used: 50-70kg/Human/ day;

　　5. guesthouses flowers sprinkle spray the water used: 80-120kg/Human/day;

　　6. soaks the bathtub water used: 300-500kg/Human/day.

　　Determined one day-long uses hot water total quantity P (kg), P (kg)÷F (kg)/M2, then solar energy collection heat area S (m2), matches 0.1m3/ according to each square meter solar energy collection heatThe m2 heat preservation water tank capacity allocated proportion relations, may figure out the heat preservation water tank capacity:V=S (m2) *0.1m3/M2.

　　The solar-powered water heater construction cost and the solar energy collection heat area and the heat preservation water tank volume has the direct relations, approaches in the direct ratio relations, from the user long term, the synthesis benefit angle considered, suitably　chooses the big solar energy collection heat area, is advantageous to the user, because primary invests solar energy hot water sufficient somewhat, later 15 years save the operating cost.

　　Second, choice solar energy collection heat
　　After the solar-powered water heater area size　determination,should designate the solar energy collection heat type, in thedomestic market uses at present the solar energy collection heat type mainly has: The plate type, the vacuum tubular, are hot tubular, Utubular and so on four kinds, four kind of types have the good and badpoints respectively, one kind has not been perfect, holds the　absolute superiority. The user choice solar energy collection heat type mainly should act according to the installation site as well as needs the hot water temperature, the use in the climate characteristic designated, regarding winter and so on Guangdong, Fujian,Hainan, Guangxi, Yunnan does not ice up the south area user, selects with the plate-type solar energy collection heat is extremely appropriate, because does not need to consider the winter anti- frozen question, but the plate solar energy collection heat shortcoming is

anti- is not frozen,therefore in the south area use, this shortcoming cannot display, but the plate merit is actually extremely prominent: Thermal efficiency high, the metal tube beat structure, exempts the maintenance, 15 years life, the price is higher than. Yangtze River, Huanghe River valley area user, because the winter can ice up, moreover the winter temperature is higher than -20 ℃, therefore selects the vacuum tube solar energy collection heat is quite appropriate, also may anti- frozen, the natural price the heat pipe, the U tube is also higher than, but the vacuum tube main shortcoming is: The bearing pressure, the easy knot boiler scale, not to be easy to rupture.

　　In northeast three provinces, Inner Mongolian, Xinjiang, the Tibet areas user must select the heat pipe solar energy collection heat, because of the heat pipe anti- -40 ℃ low　temperature ,the plate type, the vacuum tube all is unable to resist so the low temperature, but heat pipe construction cost too high, too expensive, moreover the thermal efficiency is lowest.

　　Regarding industry use hot water, general request high temperature 70-90 ℃, and request bearing pressure, then selects the U tube is the comparison takes into account, it may the bearing pressure,produce the water temperature high, the price also is lower than the heat pipe.

　　In summary, the different type solar energy collection heat is not absolutely good, the bad division, more importantly must act according to uses local the climate characteristic and the use chooses the most dominance price compared to the type, do not have by certain factory misleading, to waste money.

　　Third, solar-powered water heater system design plan choice

　　The solar-powered water heater profession was just starts 10 year emerging professions, the product does not have the standardization, the design proposal also has very big difference, now

is in the time which hundred school of thought contended, to all flowers bloom together, to the profession technology advancement said was extremely advantageous, the product technology renewal could quicker, but said to the purchase, then will feel has difficulty which selected definitely, various factories all said own good, said other was not good, this letter whose? 　　　Really difficult to make a decision!

　　Actually, when by profession in specialized level appraisal solar-powered water heater system design plan, should key appraise following five, might basically reflects the design proposal the fit and unfit quality:

　　1. designs heating water volume is whether sufficient? Collection heat area, water tank capacity whether do suffice in a big way?

　　2. assists the heater the power whether suffices in a big way? In principle heats up the time in rainy days the start assistance to be supposed to satisfy the water used request completely in 3-5 hour;

　　3. if user's water consumption, the water used time changes, whether this system also does satisfy the user the request? (Because in actual use, user's water consumption, water used time is can change frequently);

　　4. under each kind of weather condition, in each kind of water used time, in water consumption change situation, this system whether had achieved maximum limit used the solar energy, most little has consumed the conventional energy source, namely whether greatest degree energy conservation?

　　5. prices is whether higher than?

　　If through each kind of plan comparison, discovered above question the answer all is the affirmation, then was the very outstanding design proposal, otherwise so long as had a question the answer is negative, then this design proposal was not perfect, even was failing grade, the purchase only then with the oneself intelligence and ability, the knowledge, compared above five aspects to carry on the appraisal, might own make a decision.

　　Fourth, choice material

　　Set of large-scale solar-powered water heaters, all material category reaches several hundred kinds much, aspect and so on material fit and unfit quality direct pass assembly thermal effect, reliability, life, security. In principle said that, use all materials all should achieve the national standard the material, but part of important materials achieved merely the national standard is insufficient, specially the solar energy collection heat material also should choose after the market practical application, long-tested, the stable good material. The control system essential electric appliance part also should use the reliable extremely high world name brand, assists fuel oil which heats up all to be supposed to choose regular 316# Phi 38mm not to have meets the stainless steel pipe to catch fire the tube, do not have ordinary to use Phi 50, 63 greatly stainless steel pipes to catch fire the tube, only then like this, can achieve feels relieved the use, is convenient, economizes, otherwise, if seeks after the low price but to use poorly bears Material, then can appear cheaply buys, the expensive use phenomenon.

　　Fifth, post-sale service choice

　　Solar-powered water heater life long, cannot move, therefore requests the equipment supplier to visit the post-sale service is essential, therefore certainly must choose the supplier which has carries on the long-term post-sale service ability, generally speaking, makes the product proxy, does not have own brand the business agent or the small shop is only then the short-term serviceability, is very difficult to have the long-term serviceability, because they own existence is the short-term nature, has the self- brand consciousness under the company, the factory or the company supposes the entire capital subsidiary company direct sale the equipment, generally speaking the post-sale service has the long-term safeguard.

　　The genuine good product very little needs to visit the post-sale service, above gate post-sale service expense disbursement also low, the factory also has the confidence to decide the free warranty period is long, some 1 year, some 2 years, looking from this point, also may extrapolate the product in the certain degree the fit and unfit quality.