Water heater for Minnesota winters?

[Zanlm]

Ok that's good to hear! I know what I'm doing this weekend.
I live close to Erie Pennsylvania on a snow belt and it is pretty bad where we live and I don't want my chickens to die on my because I did stuff wrong

 

[farmrDAN]

I hear ya, this is my first year with chickens as well. Its all just one giant learning process.

 

[Vargas GIRLS]

This will be the third winter for the girls’ heir Colorado. It started Monday (10/10/2014) temperature drop from 70F to 30F, overnight 9F. Now the second day the daytime temperature 6F, night -7F!!! The forecast: next Wednesday mid 40F. Unfortunately one of the girl is molting and has wary little "winter close".
The coop ( 6.5' x 4') has a moderate heater so the inside is 30F average.
The coop has R24 insulated double walls. We used simple reliable and most important SAFE heating system:
1. Cozy Products CL Cozy Legs Flat Panel Heater 100 Watts (Amazon $39.13)

• "INDUS-TOOLS" COZY LEGS RADIANT HEATER"
• 100 watt output - 6 ft. power cord
• Can be wall mounted or moved from room to room for personal comfort. The stand is SOLD SEPARATELY
• Safe to touch when in use - will not burn skin or clothing
• Low energy consumption - one tenth the cost to operate as a conventional space heater

2. Water bucket whit nipples and heater.
The heater is submersible "Multi-Use Utility De-Icier" with thermostat.
Source: Murdoch's Ranch & Home. $43.00
3. Both plugged in a Thermostatically Controlled Outlet, grounded. "THERMO CUBE"
On at 35F / 2C, Off at 45F / 7C.
Important: Grounding and the right Fuse!