Boiler Setup Advice

wpmike

Attached is diagram of a hot water system, the boiler will be oil fired and emitters will be 3/4" baseboard. I decided to use delta T pumps to vary the flow rate based on the heat load. Do you see any issues using these types of pumps or setup?

In the scenario 1 zone is calling for heat, the load is low compared to the boiler capacity. How does the boiler react? Meaning does the boiler cycle on and off, to avoid reaching the boiling point of water. Which I would think would be a bad thing in a hot water system. Pleading my ignorance if someone could explain...

Thanks in Advance

Mike

HVACNUT

Look into outdoor reset or an aquastat with thermal targeting.

RayWohlfarth

@wpmike I would be careful and make sure the smallest zone pump has enough flow through the boiler. If flow is inadequate, you could damage the boiler

wpmike

Thanks for pointing out that aquastat device according to this article it turns the burner on and off to control the water temperature.

https://highperformancehvac.com/boiler-components-aquastat-temperature-control/

In most multizone installs how does the boiler handle only one zone calling for heat? The boiler will likely produce more heat than is required for that one zone.

EBEBRATT-Ed

primary secondary will ensure flow through the boiler