I get so close to purchasing a boiler and then i'm not sure if it's the right one. I need a 60k boiler. i will have 1000gal storage. the more i read about the lambda controls the more i think that would be a good idea. i guess the only thing that is really hanging me up is the back-up heat for when i leave for a week or two and cannot feed the fire. biomass has a combo with LP that would work and i think wood gun does to or should i go strictly wood and add another LP boiler into the system in the future? the system will be in the shop 180' from the house. I could also use my existing f/a furnace to heat house when i'm gone and just bypass the heat exchanger in it while leaving the circ. pump going. Would that be enough to prevent the system from freezing?