Bristol couple Michael and Maryl Steyn placed a 5% deposit and got a 75% loan to value mortgage using a 20% equity loan from the government and Bovis Homes.
FirstBuy is designed to get first-time buyers or those re-entering the market onto the property ladder.
The buyer has 25 years to pay back the equity loan of which the first five years are interest-free.
Michael Steyn said: “FirstBuy represented an affordable way for us to get onto the property ladder.
“Saving a deposit up to a minimum of 20-25% of the value of the property had been an extremely daunting prospect but FirstBuy gave us the opportunity to buy through the support of an equity loan, with only a 5% deposit needed from us.”