  NbRh$_{2}$B$_{2}$ crystallises in a chiral noncentrosymmetric structure and
exhibits bulk type-II superconductivity below $7.46(5)$~K. Here we show that
the temperature dependence of the upper critical field deviates from the
behaviour expected for both Werthamer-Helfand-Hohenberg and the Ginzburg-Landau
models and that $\mu_{0}H_{\mathrm{c2}}\left(0\right)\approx 18$~T exceeds the
Pauli paramagnetic limit, $\mu_{0}H_{\mathrm{P}}=13.9$~T. We explore the
reasons for this enhancement. Transverse-field muon spectroscopy measurements
suggest that the superconducting gap is either $s$-wave or
$\left(s+s\right)$-wave, and the pressure dependence of $T_{\mathrm{c}}$
reveals the superconducting gap is primarily $s$-wave in character. The
magnetic penetration depth $\lambda(0) = 595(5)$~nm. Heat capacity measurements
reveal the presence of a multigap $\left(s+s\right)$-wave superconducting order
parameter and moderate electron-phonon coupling.
