I'm in the northeast and have a 20+ yr old oil fired boiler that also heats the domestic water. A contractor's suggesting the Triangle Tube Excellence line and I see it doesn't get excellent comments n a rating's site. Don't know where to turn for advice, so here I am. We have 3 bedrooms, sometimes six people showering in a row. At present it's not a problem but I don't want problems after a switch from oil propane or after buying the wrong boiler altogether. The TT site says the capacity is 180GPH. Is that enough? Also, is it a decent boiler compared to replacing it with a more efficient oil fed boiler?

Thanks very much.