I am starting my piping in the house and was wandering what if anything needs to be changed with my piping.
the first zones is DHW thru a flat plate exchanger the second is a Water-to -Air in the furnace. zone 3 and 4 are under floor radiant and in floor radiant.
one question i have is how to get the furnace to fire if the boiler temp is low or dose not reach a set temp thru the exchanger.
![Piping ? Piping ?](https://www.hearth.com/talk/data/attachments/121/121881-3822360e5c7d4e322ce8d7b43e7dc462.jpg)
the first zones is DHW thru a flat plate exchanger the second is a Water-to -Air in the furnace. zone 3 and 4 are under floor radiant and in floor radiant.
one question i have is how to get the furnace to fire if the boiler temp is low or dose not reach a set temp thru the exchanger.
![Piping ? Piping ?](https://www.hearth.com/talk/data/attachments/121/121881-3822360e5c7d4e322ce8d7b43e7dc462.jpg)