Hartell Heh 10 Brushless DC PumpWrite a review

We bought a Hartell HEH 10 DC pump as a backup for our 240V pump to drive our Central Heating System with 5 radiators from our 12V Solar Battery bank.
It works very well and seems to be as power full as our 240V pump with 40W/65W, although it needs only 18W. The circulating noise is a bit more than that from the mains pump, but still ok.
We can recommend this pump.

I am trying to replace a Hartell pump for a residential water heater, The pump I have now is a Hartell CP-3B-12He 1/2 x 1/2 MPT inline Pump Hd.

Can you tell me what best match this pump for a replacement.
Please reply.thanks

Depending on what size your PV panel is, that will steer you toward which pump will work with it, but with that said you only have two that are good pumps , March and El-Sid when a 10 watt or smaller panel is being used.