This is a model I designed and folded back in 2016. It is made from the same kind of units as Single-Module Modular Heart. Any number of units can be used since the model is a linear chain. With a long enough string of units, the coil can be closed and its ends connected, forming a Heart-Shaped Torus. This also means that the single heart can be considered a special case of this model.
Model on my page: origami.kosmulski.org/models/heart-shaped-coil