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Gas Fired Combi Water Heater/Furnace

Hi, my 1952 home has the original oil-burning furnace. We have a gas line in the house so we are going to convert to gas heating. We also have a gas water heater that's nearing the end of its life. Two plumbers suggested a combi gas water heater/furnace, and one plumber recommended separate units. Does anyone here have recommendations about what to put in? The separate units are a Crown Mega Store Indirect Water Heater and Viessman Vitodens 200 series high efficiency wall hung boiler. The combi systems were HTP Combi Unit or IBC Combi Unit. 

It's a one-bathroom house but we plan to add a bathroom in the hopefully near future. I've heard that the Combi systems aren't great for producing enough hot water at a time. 

Re: Gas Fired Combi Water Heater/Furnace


I have never had to use a boiler, but anytime that you have one unit doing more than one job, is always, iffy. I have always liked having a stand alone water heater, and a stand alone furance. But a boiler is something different than a forced air unit. Keep this in mind, if one is down for maintenace, you lose both heat and water.

I use natural gas to heat, create hot water, cook, and supply 8 fireplaces. It is clean and nice. We have 3 forced air furnaces, one for each floor and 2 A.O. Smith 75 gallon HE water heaters to supply 4 bathrooms, kitchen and laundry. We had all appliances and showers going at the same time for more than 2 hours. The A.O.Smith water heaters never struggled to keep up.

Just my 3 cents


Handy Andy In Mt Airy NC

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