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.

BASIC DATA

Model	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-305	316L	305,000
RP-495	316L	495,000
RP-995	316L	995,000
B TI-180	Titanium**	185,000
B TI-300	Titanium**	305,000
B TI-500	Titanium**	495,000

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

**Titanium 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.