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I am replacing an WM HE2 147,000 BTU, I have done the SlantFin Explorer Heat loss and I come up with a need for 85,000 BTU. Not sure how long we plan on keeping house and debating the investment for a hi eff. boiler. but if we did, it was suggested to me to go with a Triangle Tube Challenger or a WM Eco. NG / direct vent, hot water heat. Comments recommendations, ect????? Need some good advice.