Jim Dunmyer said the following to Gary Collier on the subject of
POWER SOURCE/PUMP (22 Jan 98  07:31:49)
 JD> Water heating boilers aren't very high pressure, almost always rated
 JD> at under 15PSI. You naturally want to figure in an expansion tank and
 JD> pressure relief valves.
If he uses a closed loop he may not even need an expansion tank i.e.:
:                       radiator    bleeder
:                   ----||||||||-----V
:                   |                |
:     utility       |         safety |
:    feed water     |        ----V----
:    ---------------|        |
:                   |    ////
:  circulator pump (O)   ////
:     or gravity    |--- ////
:                       heater
:                        coils
During the big ice storm, one ingenious fellow over here ran extension
radiator hoses from his old car's engine through a window along with 12
volts power and remounted the car's radiator with its electric fan on a
chair to heat his home. As simple as that. It was absolutely grand!
... Ice Storm of '98 refugee.
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