condensate tanks

MP1013

I have a condensate located in a crawl space under the boiler. The tank is located approx 3' vertically and 12'horizontally away from boiler. I piped boiler with equalizer and eliminated the hartford loop as suggested . I am concerned wth the location of the location of the 3/4" check valve on the pump discharge. Should it be installed at the boiler thus protecting the boiler. or should it be installed right after the pump discharge in the crawl space as suggested by manfacturer.