Side Arm Heat Exchanger - 38" Stainless Steel 3/4" & 3/4"NPT 23,000 Btu
AB Sidearm Heat Exchangers have a compact, lightweight design that allows for a quick and easy installation. Designed with natural thermosiphon heating technology, this heat exchanger is enhanced with fins to allow for higher heat transfer efficiency and to help reduce cross-contamination for potable water. This fin-enhanced design, which is 5-8 times bigger than the traditional bare tube design, produces both significant turbulence on the system side and faster heating at a greater capacity. This type of heat exchanger is recommended for smaller households of about 1-3 people or households with lower hot water usage.
Material: stainless steel 304
3/4" FPT (DHW side) and 3/4" FPT (System side)
At 23,000 Btu/hr, this product will help heat the water in a 60gal. tank
It's widely used for Domestic Hot Water Heating(potable water), Outdoor Wood Furnaces, Solar Hot Water Heating, Residential Plumbing
The difference between single wall and double wall models is that the second wall helps prevent contamination in the water if a leak should happen.
1.5-year warranty against manufacturer's defects and is UL listed.
Connection Size (DHW / System)
3/4" / 3/4"
Water to Water
Works with (Tank Size)
304 Stainless Steel
38.4" x 2"
Min. Operating Temperature
Max. Operating Temperature
FAQ and Support
Thermosiphon is a method of heat exchange through convection. By using convection, water from your hot water heater can be drawn up through your heat exchanger without the use of mechanical pumps.
Sidearm Heat Exchanger Size Choosing Guide.pdf
33" works with 40gal. water heaters. 38" works with 60gal. water heaters. 38" Double Wall works with 40gal. water heaters.