Electrics

ITC-306T is a pre-wired heating output temperature controller with time function specifically for breeding and planting. It features dual time cycle setting for day and night, allowing for two different temperatures to be set within a 24-hour period, which makes it suitable for the physiological needs of animals and plants. Furthermore, the ITC-306T is widely used in over-heat protection and automatic temperature control system of all sorts of electrical equipment for aquarium, pet breeding, hatching, fungus fermenting, seed germination accelerating, etc.

Frost heater is to guard against lower temperatures at night and earl or late in the year.

This is higher wattage than I need for this small space so set very low to turn on at 11c, the advantage is it has a built in safety guard. Many people use a lower wattage tubular heater.

Be careful not to touch the bulb with fingers as skin grease contaminates the bulb and they blow more easily. Use  the bubble wrap to protect them while inserting.

This can be used if your cable is connected inside your house.

I used this because I had it already. It is also waterproof and robust enough for outside. You could use any ordinary light if your kennel is water/weather proof.

This fits on the outside wall of your house with a hole drilled through wall for cable. Cable can be plugged into an indoor socket. Total load 13 amp.(3000 watts). I fitted a double so we could use lawn mower, waterfeature pond pump aswell. 

available from DIY shop

Weatherproof and dust-tight switched RCD socket. Manufactured from robust, impact-resistant polycarbonate with multiple gland entry positions.

Cable needs to be uv resistant , you can also put it through some tubing to protect it if it is running a distance..