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Heat Pump Hot Water. Power it with Solar PV and its efficiency cannot be beaten by solar thermal. Bloody expensive though.

If you are looking for the most efficient solar hot water system then solar PV panels powering a heat pump are hard to beat.

While both the panels and heat pump will need to be proficient performers, it is possible for the combination to beat solar thermal hot water which is widely considered the most efficient method. [Read more…]

Update: since publishing this article commenters have made us aware of 3 other hot water diverters on the Australian market, the ‘Dimplex Free-E’ and, The Fronius OhmPilot and a unit from SolarEdge. We’ll add these to the comparison table as soon as we have enough info. If you know of any others let us know.

I recently wrote about solar hot water diverters.  These devices use your surplus solar electricity to power your hot water cylinder.

They can cut your electricity bills provided your solar feed-in tariff is less than the cost of the grid electricity used to heat your water — which is not always the case.

I am going to assume you’ve read my earlier article, done your research, and decided a solar hot water diverter is for you.  You’ve either determined it will save you money or it was love at first comprehension of the concept and you’ve realized you can’t live without one.  So the question becomes, which diverter should you choose? [Read more…]