Dripwall Delta. Get Seedlings Started Earlier

I started the dripwall project using aluminium insect screen to absorb heat from the air in the greenhouse. I though dripping water down the screen would absorb heat from the air and transfer it to the drip of water (but it did not work as planned). I abandoned screen and tried sheet metal, cooking trays, slate and charred 1 by 8 timber. They worked to absorb heat directly from the sky or from the sun instead. In the trial model I made it only absorbed about 50 watts at best, and transferred it to the water. The water just dripped into my seedling tray and got recirculated. Only 3 liters per hour and a max water heat increase of about 15 degrees in the water in full sun in February. When it was cloudy, it only gave a degree or 2 rise and when it was raining, it was less again. (Guess the rain absorbs heat or light radiation from the sky). I did a very crude version but the results impressed me. It got germinated seed through a week of below zero weather in a greenhouse, (but the greenhouse had an inch or 2 of ice on water in it). The drain of the dripwall was the only place on my property where azolla water fern survived the winter. I hope people look into this as one way to extend their gardening seasons. (I sowed cabbage, kohl rabi, new zealand spinach and beets in the unheated greenhouse on 20 January just to test the drip wall.) I wasn't expecting them all to survive. But they did. I show my simple version and a hydronic version. (I did not do hydronic because the chance of the water freezing for a week was too great). But in theory a hydronic version would be far more efficient. The dripwall is powered by an airlift pump and about 1 watt of electricity. I plan to run the air pump from a 15 watt solar panel next year but havn't found a good 12 volt air pump yet. The air pump is 100 ft away and it powers several other airlift pumps at the same time. The playlist about the dripwall project is at https://www.youtube.com/playlist?list=PLkzXlmAwZTZfdL3kdnXUFzyaH09X2Wx1- Brian