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Dave,
Since you already have propane for the house, if the house propane tank 
is not too far from the shop, and the house tank is big enough, you 
could run a copper line from the tank (or house) to the shop and run 
both buildings off of one tank. We have just that setup here in Texas. 
The copper is 5/8", and we have a 2 stage regulator system, one 
regulator at the tank, and a another regulator at each building. to drop 
the pressure to what is needed. If you have to buy new regulators they 
should run about $50 each.
Some installations have only a single regulator at the tank, but that 
would require a larger gas line than 5/8" to not have a pressure drop 
when you are heating the shop and the house is using gas also.
Our house has gas water heater, cook top and furnace. The shop has a 
central heat/cool system, and the apartment on top of the shop also has 
a heat/cool, plus stove and water heater.
We run out of a 250 gal. tank and require about 3 fill ups a year. If 
you can run for longer than several months on the house tank you 
shouldn't have a problem getting at least a month of usage with both the 
house and shop running.
Peace,
Pat
David C. wrote:
>
> I'm getting ready to order a Mr Heater Big Max 75,000 BTU heater for 
> my shop.  The shop is a 24 x 48' pole building, with partially (badly) 
> insulated walls and some insulation in between the rafters and the 
> metal roof.  I only plan to heat it when I'm actually working out 
> there.  Right now I use a 40,000 BTU propane torpedo heater run off a 
> 20# tank, which works ok to get the chill off, but it won't raise the 
> inside temperature much above 45 degrees when it's in the low 30s 
> outside.  It's also noisy as hell.
>
> Does anyone have one of these heaters, or a similar one like a Modine 
> Hot Dawg, Modine PD, etc?  I'm mostly concerned about noise and 
> safety, and I would prefer one without a standing pilot light as I 
> only plan to operate the heater when I'm in the shop, mostly on 
> weekends.  Any gotchas on mounting or plumbing?   I plan to use a 
> horizontal vent through the wall, and I may not even run a thermostat, 
> just an on-off switch.  Also, how big a tank should I buy?  I know the 
> 20# tanks are way too small, and I suspect a 30 would be, too.  Since 
> we heat our house with propane, should I just get a 100 gallon or so 
> tank and have the propane delivery guy keep it full?
>
> thanks
> Dave C
>
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