Can be divided into cast iron type, cylinder type, steel type, water storage type, plate type.
cast iron
The cast iron type is bulky and heavy. But the copper pipe inside can be opened and checked before buying, it is not easy to be deceived by merchants, and the copper pipe can be replaced after it has been used for a few years.
Cartridge
The cartridge type has small volume and high exchange efficiency. But the user can't check the length of the copper tube inside, and can't replace the copper tube, and it's not very beautiful.
steel
Steel models are available in large and small sizes. The user also cannot view the length of the copper pipes inside, and cannot replace the copper pipes. But more beautiful.
plate
Plate type, small volume and low weight. The heat exchange efficiency is very high. No copper pipes inside. The heat exchange capacity is related to the number of layers. The number of layers can be seen and touched.