Will npower supply 2 iHeaters 1800W needs @600W running at 600W each
If you are talking about the NPower system offered by Northern Tool or other suppliers the answer is yes, for a few hours and then the batteries will be depleted and it will take twice as many hours to recharge as it did to discharge, with just the single 600W turbine. The Xantrex 1800W inverter provided with this system is not rated for more than 12A, or 1440W continuous and resistive loads like a heater are not the best use of stored DC energy in the small quantities this system will provide. It would be great for running your lights or a blower for your furnace, but not for a source of heat, just not a big enough system. As for the tankless water heater, it would **** all the juice out of your batteries and smoke that little inverter. Last one I installed took three, 60 amp double breakers to run it, yes there are smaller ones, they take two or three 40 amp double breakers, depending on wattage. Better to look into a direct solar to water or solar to intermediate fluid to heat water in a tank with a heat exchanger.This system is ok for emergency use, standby use to keep a few small appliances running for a very few hours. It is not "robust" enough to consider as the main heating provider, unless your live in southern Texas or Key West, and since I have been to both, would say it will get cold some nights before the system has time to recharge.Depending on how spry you are at 82, you might be able to put together a system that will give you some relief from the high fuel oil costs, it would be some passive additions to windows, doors and possibly a few things that might look funny on the outside of the house, but will generate heat during the day. Research, research, research. Best thing I can reccomend you do at this point. Once you have good data in hand, then research some more on where to buy and if required, who to install it.Good luck!