Tankless Boiler with Radiators
I am in need of replacing my oil fired boiler, it heats my hot water too. I live in Delaware in a 2200 square foot, 1900's farmhouse with original radiators. I am on well water, and I think it to be rather acidic. I am planning to replace the oil fired with a natural gas boiler.
I would like to know if a natural gas, tankless boiler, will work WELL with a radiator system. I am told by some heating people yes, and some no. The no people I think, if I understand them correctly, say the efficiency, of the system, will be diminished greatly, because radiators need a good amount of water to be to be heated and at a very high temperature, before it circulates through the radiators, and a tankless boiler will not do this properly for radiators to operate properly.
A heating person made the comment that the system he would propose has a low loss header, built in to it, or maybe it is an accessory you purchase separately. He said this makes everything ok with my old radiator system, and I need not be concerned.
Thanks, in advance, for any input, and until someone can straighten me out, I shall remain,
My existing set up is:
5 Section Boiler (heats my domestic hot water)
1.5 Burner Capacity
186 Valve Capacity
Condensing Wall Mounted Gas Boiler with Radiators
Thanks for your reply.
I may have used "tankless" in the title, incorrectly. I will edit it to read "condensing wall mounted gas boiler with radiators."
The system I am speaking of is a 175,00 BTU condensing wall mounted gas boiler by Rinnai model Q175S. The Minimum/Maximum Gas Rate Input BTUs (Heating): 35,000 - 175,000 (NG) It is what they call a combi unit which is designed for heat, and domestic hot water. I am just not sure how compatible this is with the old radiators.
I am not sure, but I think the BTUs, on my oil system, are at 144,300, because some of that accounts for the boiler heating the hot water? So far, I have only gotten two heating people who have asked for the dimensions of the existing radiators, and the number of passes in them, everyone else, I think is just going by what it says on the id plate, which, as you indicated, could actually be wrong. Not sure how you tweak the Rinnai but it looks like one model can accommodation any where from 35,000 to 175,000 BTUs.
What would be the difference between an indirect, and an independent gas hot water heater? Is one better than the other, would one cost considerably more, than the other?