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Condensing boiler with duct coil
Home owner is going from a oil boiler with coil to natural gas heat.
Heating contractor told me he is looking to use a 95% AFUE natural gas furnace with 50 gallon power vented water heater. Home owner wants AC
He does not have the clearance to sidewall Vent two units.
Then he asked if he could use a natural gas combi boiler ($1800 home owner rebate from the gas utility) with a duct coil on the AC air handler. If the hot water duct coil is over sized to run as low of water temp as possible will this boiler condense?
Should he use a 30 gallon buffer tank?
Will this type of system work?