Solar Water Heating FAQ Wellington
Solar water heating is a method of using sunlight to heat water with the help of solar thermal collectors. This heated water is then stored for use in insulated hot water tanks. Solar water heaters are efficient but sometimes may require external energy boosters if sunlight is not enough.
Solar Water Heating Frequently Asked Questions
Are Evacuated Tubes better than Flat Plate?
Tubes are slightly more efficient particularly U tube types. Flat plate are less likely to be damaged by hail or stones. Evacuated tubes are more efficient in winter and later in the afternoon. Flat plates are usually better at midday.
Can I use my existing tank?
Tank size depends on the number of people consuming the supplied hot water. 1 person = 135 litre, 2 people = 180 litre, 3 people = 225 litre, 4 people = 250 litre, 6 people = 300 litre. If your tank has that much capacity that will be fine. If not, a smaller collector will be used and the installation will not meet your daily needs. With solar water heating, the daily hot water requirement needs to be collected between sun rise and sunset.
Does the pump need much power?
Pump usually needs around 15 to 25 watts when it is running. The pump runs when the sun has heated the collector.
Are we approved EECA installers?
Yes, Southern Plumbing is EECA approved installer.
What happens if the power is turned off?
The pump stops working. The controller will restart when the power is turned on.
Can I have solar water heating when my roof faces east or west?
No, not unless we can put the collector some other place facing the north.
Can I have solar water heating if my collector area is half shaded?
No, it is difficult to collect enough hot water to repay the installation.
What maintenance is needed in solar water heating?
Wash the collector once per year, check the pipe insulation, check the pump is operating, change the glycol if your system has it, not many do. Check plumbing for leaks, if the system is closed loop check it still has pressure on the pressure gauge. Lastly, check the roof fixings.
Who Can Install a Solar Water Heater Plumbing?
A licensed plumber can install solar water heaters. Southern Plumbing is a certified plumbing company, you can contact us for installing solar water heaters in your premises.
What Happens in the Winter?
Solar water heaters don’t get as much sun as needed, but will heat the water from cold to about 30-40 degrees depending on whether the collector has been correctly sized. The collector will heat water even when it has been raining all day.