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Ours costs a big fat $0 to run most of the time, and the rest of the time (ie, winter) we put the booster on, which uses about $10 per quarter offpeak.However, I'm also interested to know if a solar system can really be cost effective in the longer term- especially given the claims of the people selling.
I know nothing about hot water systems, so what I am about to say may be totally wrong. Anyway, I was doing some reading on the subject and something I read said that the solar ones won't really save you any money because they still rely on electricity to pump the water onto the roof to heat, then they have to keep it heated until you want to use it.
have seen advertised, an addon small pv panel and pump. the pump runs when there is light and therefore when the water is heating, automatically, no electricity, runs faster when there is more light, so the water always returns to the tank hottest.I know nothing about hot water systems, so what I am about to say may be totally wrong. Anyway, I was doing some reading on the subject and something I read said that the solar ones won't really save you any money because they still rely on electricity to pump the water onto the roof to heat, then they have to keep it heated until you want to use it.
I think consultant is right, hot water is more efficient than pv, by huge amount, pv panels are still in development,The consultant said I would get more benefit by getting a smaller system than I was enquiring about, and adding the hot water system. It would be cheaper too.
At my old house, anywhere from $100-600 per quarter (winter quarter ALWAYS higher) and the hot water was the offpeak bit, usually $10-20 of that bill. We had a very small electric storage HWS though, can't remember if it is 80 or 110L. We also only used 80-90L of water a day total (we use 300L at the new house) with 4 people ... saved the bathwater for flushing the loo withhow much do you pay for electricity and can you see how much of that is for hot water.