: After a lot of thought, I've decided to abandon the convection hot water return approach in my new house, and opt for a pump which I can put on a timer, and kick off for 15 minutes in the morning, and for maybe an hour or so at night. (Will be insulating pipes as well, but the runs are long.)

: Which companies make pumps for this purpose (low flow, low power?) Do any of them have built in solenoid valves, so when the thing is off, it won't allow a convection loop to occur?

DavidH,
Most plumbers seem to be using the Grundfos pumps
The link below has more information.
Terry

• Grundfos water recirc page