  EPIC 216747137 is a new HW~Virginis system discovered by the Kepler
spacecraft during its K2 "second life". Like the other HW Vir systems, EPIC
216747137 is a post-common-envelope eclipsing binary consisting of a hot
subluminous star and a cool low-mass companion. The short orbital period of
3.87 hours produces a strong reflection effect from the secondary (~9% in the R
band). Together with AA Dor and V1828 Aql, EPIC 216747137 belongs to a small
subgroup of HW Vir systems with a hot evolved sdOB primary. We find the
following atmospheric parameters for the hot component: Teff=40400$\pm$1000 K,
logg=5.56$\pm$0.06, log(N(He)/N(H))=$-$2.59$\pm$0.05. The sdOB rotational
velocity vsini=51$\pm$10 km/s implies that the stellar rotation is slower than
the orbital revolution and the system is not synchronized. When we combine
photometric and spectroscopic results with the Gaia parallax, the best solution
for the system corresponds to a primary with a mass of about 0.62 Msun close
to, and likely beyond, the central helium exhaustion, while the cool M-dwarf
companion has a mass of about 0.11 Msun.
