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Posted by Dave on January 29, 2007 at 08:21:56:
In Reply to: Re: Size expansion tank posted by Ron on January 26, 2007 at 20:53:50:
: Again it depends on the type of radiation and boiler size. For example the WBV04 has a DOE output of 117K to 179K. If the boiler is fired at the smallest rate and connected to a copper tube aluminum fin system it would have an output of 117k and require a # 30 Tank. The same system fired at the largest output of 179K it would require a #60 tank. But, if the smaller rate had some cast iron radiation it would require a #60 instead of a #30. The addition of all the antifreeze not only should it have a larger tank but maybe a larger circulator also. Note: the tank sizes change slightly for different manufacturers.
Is there any downside to using a 60? Other than being a little more expensive? I'm leaning towards changing it.
You may know this too, the 30 gals of P Glycol in the system is Cryotek. I'm going to add another zone to the system and I have 10 gallons of new Dowfrost which is also propylene glycol for this purpose. As far as I know it is OK to mix these two as they are both PG for hydronic systems, just from different manufacturers. I have the equipment to test the PH and freeze point.