The author’s pressurized system is 30 years old and still has the original propylene glycol in it—a testament to good design.
Courtesy Bob Ramlow
Large, wintertime-weighted—or space-heating combisystems—often produce excess heat in the summer, but a properly designed system will include measures for mitigating overheating. The author’s pressurized system is 30 years old and still has the original propylene glycol in it—a testament to good design.
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