On 27/02/2018 22:22, Jeff Layman wrote:
On 27/02/18 21:49, Tim Watts wrote:
On 27/02/18 21:14, Martin Brown wrote:
On 27/02/2018 20:41, Enrie Membership wrote:

I've just had a 6' x 6' shed erected in the garden to house a few
stationary engines which I want to keep above freezing in the winter.
I do have an electrical supply nearby. What are folks thoughts on the
most efficient form of heating that will keep the shed just above
freezing point?.

Insulate the walls as best you can with polystyrene sheet. Try and avoid
drafts.

Electrical Tubular heater 5' 200w (has the advantage of having a
frostat onboard)

That or a modest fan heater on its frost stat setting.

I wouldn't - modern fan heaters can be a horrid fire risk - bit of fluff
builds up inside the front grille and you get a red-hot spot (I've
seen it).

Absolute nonsense. I've been using fan heaters in greenhouses for over
20 years. All sorts of crud on the elements - spiders' webs, dust, small
dead leaves, other plant-based material, etc, and I've never seen or
smelt evidence of burning. After about eight years, I did have one
element go o/c, though, and I've had a thermostat fail with crud on the
contact points. And I only use the absolutely cheapest 1 - 2kW fan heaters.

Mine have always been fine in the greenhouse too.

Anyway, if someone was really concerned about fire, they could always
use a ceramic-element fan heater.

The other option are the rod type oil filled heaters. The main advantage
of a fan heater in a modest sized space is that it stirs the air around
so you don't get cold spots where condensation can occur.

--
Regards,
Martin Brown