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Help! Want an efficient HW & Heating Nat gas system
Hi there everyone, this is my first post on here. Here's my situation. Bought a 4 unit apartment building that is currently oil fired baseboard heat and hot water boiler for all 4 apartments. I want to switch to natural gas as it is cheap in my part of SE Pennsylvania. I had the following idea: To heat and give hot water to all 4 apartments, I was going to put in a Tankless Navien 240 Combi HW Heater/Boiler system (199K btu). This was to heat the 4 apts (total sq foot of 2000), handle 4 showers/sinks, and 1 dishwasher.
After talking with my local heating supply store, they told me that system was probably going to be inadequate. So right now, prior to your help, I am contemplating the following:
1) Install 2 Navien systems with an old HW heating tank to act as a tempering tank for the water. I would separate the heat so that each Navien unit services 2 apartments only.
2) Find a better and bigger combination unit system that can handle 4 apts with 4 separate thermostats.
3) Ditch the tankless boiler idea. Go with a 1 Navien HW tankless system along with a traditional gas fired boiler.
4) Pull my hair out, except I am already bald!
Anyone have suggestions?