My last circ 12 VDC circ pump was a Hartell, and was in use for about 20 years here in the Idaho mountains, powered by a 30 watt PV panel. It gave it up last week (started to make a screeching noise) and I see they no longer make them. March used to make 12 v pumps, no more also. Ivan Labs also seemed to have gotten out of the pump business. This is for my closed loop 3 Heliodyne thermal panels system that provides all my domestic hot water plus contributes to the rad floor heating system. I have been without it for the last week, and I miss it terribly! After purusing various questionable pumps, I decided not to cheap out, and I just pulled the trigger on this: https://www.amazon.com/Solar-Hot-Water-Pumps-6-0/dp/B00QMBNTYA?ref_=ast_sto_dp&th=1&psc=1 You get what you pay for I guess, the Hartell was similar priced, and that was 20 years ago. It will bolt right up, same outlet spacing, and after I reprime the system I'll be back in business. This is the first time the system, has been opened up in 15 years, totally trouble free during that time.