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[Pointblank]

In my search for a replacement to my 5648, I've noticed most manufacturers now require a thermostatic bypass to be installed. The way I understand this is it will close at 150 degrees and recirculate the water back to the boiler. If this is the case,  it seems I will loose the freeze up protection I now have when my propane furnace comes on. 

Am I understanding this correctly? If so, any other options other than antifreeze for freeze up protection?

[slimjim]

There are better ways to accomplish both desired tasks but I'm not sure if CB would approve.

[hondaracer2oo4]

Can't you just put the bypass valve inside the house? That should solve your freeze up issue.

[boilerman]

The thermostatic valve is installed in the house and it does not close to 100%. Even if water drops below 150 degrees it allows enough water through to accept back feed heat from the in house coil in the now backup forced air system or a plate exchanger to keep lines and outdoor boiler from freezing.

[Pointblank]

The thermostatic valve is installed in the house and it does not close to 100%. Even if water drops below 150 degrees it allows enough water through to accept back feed heat from the in house coil in the now backup forced air system or a plate exchanger to keep lines and outdoor boiler from freezing.

OK cool, good to know.   
Thanks!