anti-freeze setting on radiator

[blackhead]

I've got a snow flake symbol on my radiator which presumably prevents
freezing of the water in the radiator. When the boiler powers up, the
radiator gives out maximum heat and after a while completely shuts
off. How does it work?

[Andy Burns]

http://en.wikipedia.org/wiki/Thermostatic_Radiator_Valve

[Phil L]

The snowflake indicates cold, whereas the numbers after it (1 to 5) indicate
heat settings, 1 being the lowest and 5 the highest, instead of this, they
were going to paint on small flames, gradually increasing them to large
flames as heat indicators but decided against it in case some people tried
to light their radiators thinking the flames were an instruction rather than
a guide.

[Andrew Gabriel]

In article <36e60c95-6005-42a4...@d4g2000prg.googlegroups.com>,

blackhead <larry...@softhome.net> writes:
> I've got a snow flake symbol on my radiator which presumably prevents
> freezing of the water in the radiator.

No, it prevents the room dropping to the temperature where any water
in it will freeze (not just the radiator). It's frost protection for
the room, not just the rad.

> When the boiler powers up, the
> radiator gives out maximum heat and after a while completely shuts
> off. How does it work?

Getting the room up to frost protection temperature. Bearing in mind
that some parts of the room will likely be colder than the TRV, the
frost protection temperature will probably be quite a bit above zero.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]