Solar Water Heaters: What you need to know

BCO

Honorary Master
Joined
Dec 17, 2004
Messages
13,229
Reaction score
27
Location
Slaapstad
Hi guys,

I've received a few PMs from forumites who know that I have a solar water heater and had some questions (particularly about the upcoming subsidy) for me, so I thought it'd be better just to share this knowledge in a dedicated thread. Here goes:

  • Don't confuse a solar water heater with a solar (photovoltaic) panel. Solar water heaters do NOT generate electricity, they literally heat water directly with the sun's energy and store it in a highly insulated tank.
  • Many solar water heaters also include an electric element just like a conventional geyser and if there's insufficient solar heating going on, they switch to electric. Also, some come with gas heating as an optional extra.
  • Solar water heaters are going to be subsidised by Eskom. The end user does not have to worry about having to deal with sorting out the subsidy themselves. Retailers will sell users the water heaters at the subsidised price and the retailer will claim this subsidy back from Eskom. Just as a side note, Eskom has contracted Deloitte to handle the subsidy process.
  • The subsidy process has not yet come into effect. As of today (29-01-2008) I was told that there are still 3-4 weeks to go before it comes into effect. One of the main reasons for this is that the subsidised amount is being disputed by the industry. I was part of the pilot project, and during the pilot, end users received a R6000 rebate. Currently Eskom wants to offer between R3k and R5k, and the solar water industry in SA feels that this amount is too low.
  • If you want information about the Eskom subsidy, I suggest you speak to solar water heating companies rather than to Eskom. The solar water companies are much smaller and more likely to help out individuals with information than a big juggernaut like Eskom is.

My solar heater was supplied by Solahart. I went with them because apparently they're the only SABS approved solar water heaters in SA. That's not to say they're the necessarily best, and it would be quite interesting if other existing or possible future solar water users could post their make and supplier in this thread.

I've been extremely happy with my heater - especially since it survived a massive hailstorm in JHB a few months back with no damage. I never have a problem with water not being hot either.

Finally, much of the info above was provided by Jim at Solahart, so it should be fairly accurate. Also, I have no professional affiliation with any solar water heating company.
 
Last edited:
So do you run off just solar with no electric backup and you always have hot water?
 
No, I have electrical backup in my solar heater. Gonna try a little experiment for the next couple of days and turn off the heater on the distribution board just to see what it's like with solar only.
 
With your 6k rebate, how much did it end up costing you? IE, with the subsidy could you pick up everything for almost free? or how much are you as an individual looking to put in?
 
Even with the rebate they're quite expensive. Mine cost me R14000.00. I'm pretty sure that there are cheaper units than the Solaharts though.
 
Mine's a 180l unit (used by 3 people) and its pre-subsidy price was R20k.
 
No, I have electrical backup in my solar heater. Gonna try a little experiment for the next couple of days and turn off the heater on the distribution board just to see what it's like with solar only.

Be interesting to see, although that's the best system, solar can heat it as far as possible and there's still an element so you never have no hot water.
 
I'm sorry but even a R6k subsidy on a R20k unit is not good enough.

It needs to be able to pay off in tops 5 years I feel. Eskom want us to use these things, they must make it as attractive as possible tbh.

I like the idea, but I don't like the idea of shelling out R15k(+-) on a unit.
 
I'm sorry but even a R6k subsidy on a R20k unit is not good enough.

It needs to be able to pay off in tops 5 years I feel. Eskom want us to use these things, they must make it as attractive as possible tbh.

I like the idea, but I don't like the idea of shelling out R15k(+-) on a unit.

Yeah...And if you think about it, you are now paying for another man's F-up :mad:
 
You're also paying to significantly reduce your home's carbon footprint.
 
What about Solar Panels that will fill a conventional geyser? Will that be cheaper?
 
To heat a geyser with electricty provided by solar PV panels would be much much more expensive.
 
Solar heated water to be fed directly into your geyser? Pipes instead of cells?
 
BC : I know it'll reduce the carbon footprint of my home. But thats not going to sell it to the average joe on the street.

It must reduce his bills, and be affordable, and pay itself off fairly quickly.
 
Just spoke to a friend about this, they recon on the news, that this solar heating system would only _cost_ us, 2k or 3k?
 
Top
Sign up to the MyBroadband newsletter
X