Jabsco
Ericson installed two Jabsco pumps in our '88 boat. I have replaced one, over the decades (rather than chosing to rebuild it). They can not back-syphon and can run dry.
Good quality, altho not as cheap as the Rule... whose design I consider to be cheap - for a reason.
ITT Jabsco 372020000 or the newer 37202 model with enclosed drive.
Loren
ps: I would never choose any pump for this purpose that could burn out an "impeller". Yikes.