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Combi (or combination) boilers are typically high efficiency systems (+90% AFUE)

Not sure
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Question: Combi (or combination) boilers are typically high efficiency systems (+90% AFUE)
Top Answer (85% of 21 votes): True.

Answer: Not sure
Explanation: Never worked on one or even seen one, so I'm not sure.
Arizona's Best Heating & AC, Inc.
Answer: Not sure
Explanation: Have not used one. With heating I would always encourage +90 AFUE.
Air Connection
Answer: True
Explanation: Heating-only condensing boilers provide a closed-loop central-heating option. Heating-and-water-heating, or combi, boilers, meanwhile, are engineered with an open loop for domestic-hot-water output and a closed loop for central heating. Thus, they can serve as both a high-efficiency, on-demand water heater and a central heating system. By installing one combi boiler per apartment, owners can individualize utilities for tenants.
Barwick Heating & Cooling
Answer: True
Explanation: Typically but not in oil fired
Answer: True
Explanation: Manufacturers vary in there efficiency but almost all combi boilers are higher efficiency and therefore can be vented in pvc and cpvc piping because more of the heat is removed by the appliance and the exhaust gas is cooler
123HVAC of Long Island
Answer: True
Explanation: wallpacks
H.O. Electric
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