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Replacing a BW Combi Core unit
I moved into a 15 year old rambler last July and my luck the combi water heater just went out a couple of weeks ago. Since the furnace is still working and spring is around the corner, I decided to swap out the water heater with a unit dedicated to supplying water to the house. For my radiant floor I was originally looking at a gas boiler, but cost of running 30 ft of SS vent and lack of boiler knowledge is steering me back to a 50gal power vent water heater. The 50gal can be vented with PVC, which is a lot better on my finances.
So my questions are:
1) Would 50gal water tank be sufficient for my setup or would I need to size up or down the tank.
2) Or should I take a look back at the boiler which would be a twice the initial cost, but savings in the long run would over weigh it.
4) Would a light secondary pump on the return 1/25hp benefit the system?.
Hydronic indirect heating
Basement slab heating around 1900 sqft with 3/4" tubing
Mainfloor 200 ft with 1/2" tubing
Bradford and White Combicor 75gal unit with mixing valve
Zone valves on the return
1/6hp Grundfos to circulate the whole system
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