The 2-year discounted product has an initial variable rate of 3.45% and the 3-year option is available at 3.49%.
Both products are available up to 70% loan to value and have a £199 application fee and a completion fee of £800.
Gev Lynott, chief executive at the Mansfield, said: “The Mansfield is committed to providing a range of attractive housing solutions including shared ownership and self-build mortgages.
“However, a growing proportion of the population find themselves unable to purchase their own home so it is important that we also help the rented sector with buy to let mortgage finance.
“The Mansfield’s buy to let mortgages also enable landlords to extend and improve their property portfolio using the capital raising flexibility we offer with these products.”