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replacing the IBC boiler
gsnake
Member Posts: 5
in Gas Heating
I have an older IBC boiler VFC15150 which I am planning to upgrade in the near future. Can you please recommend what model I should go with? I have a 5000 sq f house (radiant heat), DWH, and swimming pool that is heated through the heat exchanger. I am also wondering if I should also upgrade my venting from 2" to 3" pipes at the same time. thanks!
0
Comments

How old is the VFC? Why the replacement.? It cant be 15 yrs old...
I would install a IBC SL g3 version. Similar to the VFC in terms of pipe layout w the upgraded control...0 
it is over 15 years old. one of the first ones produced (based on the serial number). they say the heat exchanger is very solid and it does look ok so far but I am sure it will not last another 5 years
I am thinking of SL g3 as well but can't decide whether I should use 114 or 160 model (114 looks less powerful than mine but does it matter that much)?0 
If the 115 has and does work now w/ the load on it I see no need to over size it.
You size the boiler for the coldest day of the year... What is the coldest it gets where you are?0 

i have vc 15150.. it has larger numbers than 115. this is why i was skeptical to 'downgrade'.kcopp said:If the 115 has and does work now w/ the load on it I see no need to over size it.
You size the boiler for the coldest day of the year... What is the coldest it gets where you are?0 
Thanks.. but how to do it? Is there a formula?You shouldn't be guessing. Do the heat calculations on your home to pin it down. You may be surprised.
You shouldn't be guessing. Do the heat calculations on your home to pin it down. You may be surprised.
I am in Vancouver, BC. It barely gets to 5 C a couple of nights per year..kcopp said:If the 115 has and does work now w/ the load on it I see no need to over size it.
You size the boiler for the coldest day of the year... What is the coldest it gets where you are?0 
Sorry... I misread that.gsnake said:
i have vc 15150.. it has larger numbers than 115. this is why i was skeptical to 'downgrade'.kcopp said:If the 115 has and does work now w/ the load on it I see no need to over size it.
You size the boiler for the coldest day of the year... What is the coldest it gets where you are?1 
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour
Two btu per sq ft for degree difference for a slab1 
thank you guys.0
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