I’ve been poking around the Boiler Room for the past few weeks and have been impressed by the amount of knowledge and willingness to share it. Here’s a question that’s been on the edge of several threads that I’d love to discuss straight out: if you’re using a wood gasifier (with water storage) to run a radiant heating system and dhw, is it worth adding a loop with a few solar hot water panels? Is there a “sweet spot” hybrid between solar and wood? The theoretical upside seems clear enough – you could shut off the boiler for half the year and reduce your overall wood chores. But there would seem to be downsides: can solar panels get hot enough to run dhw by themselves; will the panels actually displace a significant amount of wood; if the solar system is sized large enough (6-8 panels) to make a dent in the winter season, will it require a substantial summer heat sink; is the expense of all the additional plumbing really worth it? At present I heat a 3,700 sf old farmhouse (insulated reasonably well) using 6 cords of wood (burned in two newer non-cat woodstoves), 270 gallons of oil (fha ancient backup furnace), and 670 gallons of propane (dhw plus radiant heat under 700 sf of living space.) I also heat a 800 sf greenhouse (March to May) on 200 gallons of propane. My plan this summer is to convert to a wood gasifier plus storage tank to run everything, including the greenhouse. My wood is free for my labor, but given that I’m already cutting and splitting 6 cords under the current system, I’m concerned about how much more wood chores I might be taking on. Hence the theoretical appeal of adding some solar. Any perspectives? Is there an optimal price/complexity/thermodynamic tradeoff point between gasified wood and solar?