solar hot water

Hi Everyone I was wondering how solar electricity is charged to the tenant when the landlord wants to keep it in their name so they can keep the 44c rebate. 1/ Can the owner charge the tenant for electricity and keep the rebate amount for themselves? 2/ Does the owner have to pay to...

We're extending a Victorian single front. In order to get 5* energy rating (compulsory) we have to: - either get a 2000l rainwater tank and plumb it to each of three bathrooms on two levels - get a solar hot water system Any thoughts on likely relative cost/value of these options?