Buying, credit facilities and renting options
The SWH supplier and/or installer may be able to provide credit facilities for the purchase of the system.
Credit facilities from private lenders tend to be very expensive. If buying on credit check the overall impact on the cost of the system, and the payback period after credit finance.
If you have a bond on your home some banks will extend the bond for the purchase of the SWH. Again, check the arrangement fee and costs of borrowing and compare against the electrical savings and financial savings.