I have the Diversitech Condensate Pumps in my house. I think it is the CP-22 models, but I would have to check. These were installed by the HVAC contractor. So far they have worked well.

The Diversitech's seemed to have quality control issues, so I went with a Little Giant. I've used many as pond and aquarium pumps and on that end they are unglamorous workhorses which tend to be a little too loud and hot but reliable.

Besides CAN a condensate pump in my basement be glamorous?

When I had a new furnace, air conditioner put in, shouldn't the company have also put in a new condensation pump instead of using my old one?

I would say they should have replaced the pump on a new install.

On the Beckett pump it sounds like the issue might be the check valve but if so it might not live long after replacing the check valve if you can even find one. Pump replacement would probably be the best answer.

"When I had a new furnace, air conditioner put in, shouldn't the company have also put in a new condensation pump instead of using my old one?"

What did the contract say?