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[RSI]

My system uses the following tubing and set up.

 http://www.trueleaf.net/pdf/Benchwarmer-Bro-2005.pdf

The fin type you have photos of are very hard to get and expensive. I have seen them in older boiler type greenhouses. Usually a few feet under the tables.

I have a lot of them that were taken out of an old greenhouse. I thought they would sell easy but not much interest so far.

[MTJAG]

My system uses the following tubing and set up.

 http://www.trueleaf.net/pdf/Benchwarmer-Bro-2005.pdf

The fin type you have photos of are very hard to get and expensive. I have seen them in older boiler type greenhouses. Usually a few feet under the tables.

I have a lot of them that were taken out of an old greenhouse. I thought they would sell easy but not much interest so far.

I might have an interest.  How long are they and can I pipe them together end-to-end?  Where are they located and how could we ship them?

[RSI]

There are a few different lengths from about 8' to 12' long. I can cut them down and re-thread them but might be better just using radiator hose. They were about half connected together with has and half iron pipe when  they were removed. They are 1-1/4" pipe

I am in Wisconsin. They would probably need to be shipped by LTL freight.

The simplest way to control the heat would probably be to keep a pump running continuous and use a mixing valve to control the water temperature. Once you get the water temperature set right it will keep the air temp pretty constant.