I just did a search on a Ridgid ProPress crimper.  I found one for about 
1600 bucks, so they ain't cheap.

Spiro, the radiator water, and potable water, are completely separate 
systems.  There is a tank within a tank.  The inner tank is the hot water 
for drinking and showering and such.  The boiler heats water for the 
radiators and circulates it through the jacket between the inner and outer 
tanks.  That indirectly heats the water in the inner tank.  Then, if home 
heat is needed, a circulating pump sends the water in the jacket between 
the tanks, through the radiator system.  So the two systems are 
concentric, but completely isolated from each other.

-- 
Blue skies.
Dan Rossi
Carnegie Mellon University.
E-Mail: [EMAIL PROTECTED]
Tel:    (412) 268-9081

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