Sun Rain and Four Seasons Muge belong to the same door, and belong to the listed company Sunrise East. However, the two have their own emphasis, Four Seasons Muge is positioned in the middle and high-end, the product is clearly layered, the appearance is mostly light grass green, and the price is higher; The price of solar rain is relatively low, and it has a high share in towns and villages, and the colors are mainly bright yellow and red.
 
Sun Rain is the brand with the highest sales volume in the solar water heater market, with a market share of about 9.8%. According to the data of the Ministry of Industry and Information Technology of the People's Republic of China in 2018, Sun Rain ranked first in the solar water heater brand power index, with a brand association of 79.8%. Sun Rain is also the only enterprise in the industry with the production capacity of all categories of solar thermal utilization products, and has drafted a number of national standards for solar energy.
 
The heat collection performance of the vacuum tube of the "concentrating antarctic tube" of the sun rain signature is basically the same as that of the "space tube" of the four seasons Muge. In addition to the insulated vacuum glass tube, the coating of the general vacuum tube is mainly divided into three layers, from the outside to the inside, which are the anti-reflection layer to reduce the reflection of sunlight, the absorption layer that converts light energy into heat energy, and the reflective layer that reduces external radiation. The vacuum tube of solar rain adds a multi-spectrum energy accumulation layer between them, which absorbs a wider range of Yangguan bands, thereby improving the heat collection effect. Under sufficient sunlight, the air temperature of the vacuum tube can reach 250°C, and the air temperature is the most important indicator to measure the level of solar heat collection.
 
The most classic N series of solar rain is this shaped antarctic tube, the series has 140L, 155L, 180L, 220L, 265L five capacity options, suitable for 2-3 people 140L model price of about 2900 yuan, cost-effective. This series of solar water heaters supports automatic water feeding, eliminating the need to control the water volume of the water heater through on/off, and avoiding the problem of water overflow or empty drying caused by manual operation. However, the series has two service options: bare metal home delivery and door-to-door installation, if you need installation services, each water heater also needs to pay an additional 800 yuan installation fee. The I series has the same function as the N series, but it has been expanded in volume, with a maximum capacity of 36 tubes and 300L, and the price is 7500 yuan, which is enough to support the domestic water of 7-10 people.
 
Sun Rain was not satisfied with the heat collection effect of the "concentrating South Pole tube", and then launched an upgraded version of the "black gold South Pole tube", the appearance changed from the original purple to black, the heat collection effect is better, and the temperature in the waterless air drying tube has increased from the original 250 °C to 300 °C. The water heater of the double-cabin series uses a combination of 8 black gold South Pole tubes, a decorative tube and the rest of the shaped South Pole tubes. The incubator is divided into two parts: the quick-heating chamber and the incubator, in which the fast-heating chamber is connected with the "black gold antarctic tube", plus electricity-assisted heating, which effectively solves the problem of insufficient hot water supply in rainy weather or winter. The price of this series of 135L is about 5000 yuan.
 
The national patent of the thermal insulation wall advertised by the manufacturer refers to the heat retention of the water tank for 100 hours under the condition of no light in winter, through the heat retention of the water tank, the heat retention of the vacuum tube, the heat retention of the pipeline and the electric heating, the water temperature can still be kept above 40 °C, which is the technology that most brands will use, and the technical gold content is not high. However, Sun Rain and Four Seasons Muge are the only brands that use 57.5mm polyurethane insulation, which is the thickest in the industry, compared to Haier's insulation layer thickness of 50mm and Linuo Rite's thickness of 55 or 56mm.
 
The price of solar water heaters is basically concentrated in the mainstream mid-end market, the technology is practical, and the after-sales warranty time is 3 years.