pre-heated solar water heater - QRJ

Pre-heated solar water heater also relies on the natural circulation of water between the collector and the tank (that is tubes absorb solar energy,and heats the water inside the tube,hot water rises,cold water flows down).
It differs from compact non-pressurized solar water heater because it gets a copper coil inside the inner tank. The hot water rises from the tube into the tank, and heats the copper coil and finaly heats the water inside the copper coil . Therefore the water tank is just as heat storage tank.

so the hot water we use is actually from the copper coil, it'is more clean,and even drinkable(as the copper can purify the water.).The whole system also works at 0.6MPA.

Necessary parts: Tank( with a copper coil inside),the vacuum tube, bracket
optional parts:
A controller----show water level, temparature for the conveince of cold water supply
Assistant tank---fill water in time constantly
An electric heater---when without sunshine ,etc: in rain days and winter days,use for heating water.

One advantage of this system is that almost no water is introduced into the tank (apart from occasional topping up), so corrosion and scale buildup are almost totally eliminated. Tanks are designed for low to medium pressure applications using a gravity feed tank or pressure reduction valve.

1. TANK
Outer tank material: High quality painted steel plate(white color) thickness 0.4mm;
Inner tank material: SUS304-2B food grade stainless steel plate thickness 0.5mm;
Heat preservation time: 72 Hours;

Superior heat preservation: high density polyurethane foam insulation layer thickness 55mm;

Copper coil: diameter 2mm, thickness 0.8mm.
Holes: 4 holes, water inlet and outlet, electrical heat element, vent.
2. Vacuum tube
Model: 58mm*1800mm,
double layer concentric borosilicate tempered 3.3 glass

Advantage:
1. It can be installed on the ground or low building roof.
2.The hot water is very clean that is from the heat exchanger.
3.Its life span is above 15years.
4.It can satify 3-4person shower at the same time.
5.It can operate under 6Bar(0.6Mpa) high pressure