Market Farming

[robert schuler <sunnfarm AT bellatlantic.net>]

I have 12 loops per 48" wide bench or 24 runs of tubing spaced 2" apart. I 
use a
circulating pump the same used in homes for hot water heating. I use a 
Grundfos
UP 26-96 F which is the pump favored by greenhouse growers. The pump goes on 
the
return line. Thermostat is wired to the pump, when stat calls for heat the 
pump
circulates and soon the water heater kicks in. I use a shut off valve on each
bench. The bench top will heat the whole house no extra heating is needed.
System operates at 5-15 psi. must use expansion tank and have air purge valve
somewhere in system.. ..Bob.

TxBeeFarmer wrote:

> Ok, I understand much better now.  48 loops sounds like a lot.  Is it one
> loop per bench?  You don't have flow valves on each loop to adjust the
> amount of hot water going through?   Do you have your circulating pump on
> the supply side (hot) of the loop or the return side (cold)?  I'm just
> wondering if you are using a cold water pump or one designed for hot water.
>
> In your original post, you said "I can easily heat the trays and pots
> on the benches to 70 degrees with the radiated heat capable of heating the
> whole house over head at half the cost of a modine type hot air heater."
> Are you saying you can heat the whole house with the under bench system, or
> am I not reading it correctly?
>
> Thanks
> (West Texas) Mark
> ----- Original Message -----
> From: "robert schuler" <sunnfarm AT bellatlantic.net>