The cost of your solar hot water heater and heat pump is subsidised by the application of STC’s (Small Scale Technology Certificates). STC’s are a form of currency created by the Federal Government under the Renewable Energy (Electricity) Act 2000. Our installations comply with Zone 3 STC’s. All solar hot water systems and heat pumps that are Government approved have a number of STC’s allocated to them and this number varies based on brand, size and style. The value of STC’s usually ranges on a daily basis between $15 and $40 on the STC market.