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The more i learn i am having to decide between an active vs passive system. i am also looking at this active system. The advantage is see is having a storage tank indoors vs outside on the roof. I think there's a larger capacity also because the Duda indoor tank is stainless steel lined and...

That's the one i had my eye on. Amazon has it here with "free" shipping (they just add it to the price) or can get it here direct from Duda. Here is the maintenance manual. The system does come with food grade propylene glycol as an antifreeze, but i haven't figured out if it goes inside the...

Kernal, Thank you for your input... i'm having to Google some of your terms that i am unfamiliar with, but i think i am getting a lot of what you are saying, but feel free to dumb it down for me a bit lol. Honestly, i'm just one person without a huge need for a complicated system. i live in a...

Hi Kernal, Thanks for the reply, was beginning to feel lonely. The tubes are 2.28"x 70" and 30 tubes. My understanding is they utilize glycol as a refrigerant in a sealed copper tube inside of the vacuum tube. The two collectors i am looking are either passive or active, that's about as...

i did a quick search on this and didn't get any results, so apologies if this is a redundant question. i've been wanting to install a vacuum tube water heater on my suburban dwelling for a few years now and am ready to dive in. i'm pretty handy, restored 4 historical houses, installed a mini...