  The thermoelectric properties of a three terminal quantum spin Hall (QSH)
sample are examined. Inherent helicity of the QSH sample helps to generate a
large charge power efficiently. Along with charge the system can be designed to
work as a highly efficient spin heat engine too. The advantage of a helical
over a chiral sample is that, while a multiterminal quantum Hall sample can
only work as a quantum heat engine due to broken time reversal(TR) symmetry, a
multiterminal QSH system can work effectively both as a charge/spin heat engine
as well as a charge/spin refrigerator as TR symmetry is preserved.
