The charity’s Love and Heart installations, which will be on show at the two locations between 1 and 28 February, are made out of galvanised steel and each stand at 2.5 metres tall.
Romantics are being encouraged to declare their love by paying a suggested minimum donation of £3 to write a heart-felt message on a heart-shaped fob attached on a red lock, which will then be secured onto the structures.
The stunt has been organised in support of National Heart Month to raise awareness of heart health issues with new and existing supporters.
Polly Shute, fundraising project director at BHF, said: "This new initiative is a truly innovative and creative way for us to raise fundraising support during National Heart Month.
"It appears there is a real appetite for genuine and meaningful gestures of love and Love Installations successfully taps into this while helping the BHF to continue supporting hearts across the UK."
Chris Norman, strategy director, The Good Agency, added: "We believe the best way to engage new audiences is through something interactive that allows them to express themselves in an emotional way.
"Where texts, emails and tweets are intangible and disposable we wanted to create something true that references a time when love had an element of permanency. In doing so, Love installations stands out against the fundraising event landscape."
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