Boiler zone controller with variable speed pumps?

zoom

Have a new HW boiler plumbed in. No DHW. Two heating zone pumps.

The boiler (Vitocrossal 300, CU3A) has a variable speed (VDC) logic built in to control a single circulator pump.

Is there an integrated controller that combines the 2 thermostat/zone pump controller with the variable speed output signal from the boiler itself such that both zone pumps can be run at variable speed per the boiler logic?

tc60045

No secondary, just a primary loop?

zoom

Two loops, one for upstairs one for downstairs. I have not designated either as primary at this point.

HVACNUT

@tc60045 was referring to Primary/Secondary piping.

Can you post some pics of the boiler and connected piping?

Steve Minnich

P/S would typically be unnecessary with a CU3A. Flow through the boiler isn’t a problem. The water capacity of that boiler is more than most cast iron boilers.