I am installing a Navien NCB190/060h combi boiler and have several questions:
- Can expansion tank (Extol EX30) be located below or should be above boiler.
- Is a secondary circulation pump necessary or is the internal boiler pump sufficient
- what is the auto feeding water connection and motorized feeding valve. Does this take the place of reducing valve for the water supply. Book shows only backflow preventer on the make up water.
- Can expansion tank (Extol EX30) be located below or should be above boiler.
- Is a secondary circulation pump necessary or is the internal boiler pump sufficient
- what is the auto feeding water connection and motorized feeding valve. Does this take the place of reducing valve for the water supply. Book shows only backflow preventer on the make up water.