On 7 Feb 2007 08:29:38 -0800, Ken Cook wrote:

Does anyone have an idea of the temperature at which 28 sec oil gets
too viscous to flow?

Sounds like you have some moisture in the pipes. I've not heard of it
freezing up in this area.

Something odd, maybe a U (might be very shallow) with water in it.

We've never had a problem up here even with overnight lows below -10C and
ice days. Our heating notionally goes off about 2330 until 0630 but parts
of the system are on a frost stat so when it does get that cold it will
fire up a couple of times/night.

Tank outlet is about 18" maybe 2' above the boiler but the pipe run is
quite long 20m or so all exterior apart from the last metre.

--
Cheers
Dave. pam is missing e-mail