Indirect Heat Exchangers

For some low-temp applications, a pool heater seems like the obvious choice but really isn't appropriate.  For example, the extreme salinity of sea-water pools damages the heat exchanger, and marine life is sensitive to the copper ions which will gradually be released by the heat exchanger.  For such applications, Raypak recommends instead using a hydronic boiler as the heat engine, with a stainless steel indirect heat exchanger to transfer the heat to the pool without compromising either the water chemistry or the boiler heat exchanger.  These heat exchangers make such a piping system compact and easier to design.  Consult the water chemistry table in the manual for details of which alloy to select.

Stainless Alloy
Heating Capacity (BTUH)*
RP-045 316L 45,000
RP-075 316L 75,000
RP-125 316L 125,000
RP-185 316L 185,000
RP-245 316L 245,000
RP-345 316L 305,000
RP-495 316L 495,000
RP-995 316L  995,000
CR24-185 CR24**  185,000
CR24-305 CR24**  305,000
CR24-495 CR24**  495,000

*These values are nominal, based on 140F temperature differential between incoming heating and heated water.

**CR superalloy is widely used in industrial salt water environments.  Use this where chemical conditions exceed the capacity of the 316L alloy used in the RP-series.