The diameter of the thread used to connect the radiator to the heating system. Modern radiators use standard sizes — for example,
3/4" or
1/2", less often
1" and
1 1/4". This indicator must match the dimensions of the pipes, couplings and other elements directly used for connection — otherwise, at best, you will need to install adapters, and at worst, the radiator will turn out to be unusable at all.
Usually, the larger the thread diameter, the more powerful the radiator (high power requires intensive circulation of the heating medium and an appropriate throughput at the inlet and outlet).
Radiator height. The most widespread nowadays are standard height sizes:
30 cm,
40 cm,
50 cm,
60 cm and
90 cm. In addition, you can find other options (although much less often) —
20 cm,
45 cm,
55 cm,
70 cm,
75 cm and
80 cm.
Firstly, the height of the product primarily determines the size of the space required for installation. At the same time, for models placed in a niche (see "Mounting"), this dimension actually corresponds to the required depth of this niche. In other cases, it is worth taking a certain margin in height — the radiator cannot be installed close to the floor and window sill (or other similar items). And models with a bottom connection (see above) will require additional space for the pipe connection.
Secondly, this size determines heat output: all other things being equal (including the size in width), a higher radiator will have a larger working surface area and a higher heat output (this is also true for heat exchangers in convectors). Thus, modern radiators are traditionally produced not in separate models, but in series of the same type of devices that differ onl
...y in size and thermal power.
