Hi Mawkhawk,
You might want to try getting bigger water containers (water barrels) and put your tomato flats on top of that. In addition, bubble wrap can also help with your insulation so that you can keep the temperature up during the night and those frosty days in spring. You can think of it as an inner greenhouse within the greenhouse. I use this system until I can safely heat the entire greenhouse. I just pull back the inner greenhouse during the day so that the temps don't get to high. Clip-its work well for this task.
Best of luck,
Jeff
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