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If your putting a freezer in there you will need it a lot warmer than a few degrees unless you use a cold weather freezer most manufactures recommend 14c upwards iirc my old one in the garage started to self defrost so had to move it into the house to make it freeze again the refrigerant needs to flow and can't if the outside of the freezer is too cold
 
Most efficient an cost effective way with the fastest warm up times is a good quality turbo electric convector such as a wall mounted dimplex.
A good quality one has a good thermostatic control and also variable power settings along with a programmer.
And make sure you have well insulated doors seperating the structure off from the rest of the house.
Each to thier own but imho a radiator is not the best option alot of the time in these
 
Air conditioning is the only way keep a conservatory comfortable as without it they are to hot in the summer and to cold in the winter. I have fitted hundred of heat pumps (as there called by some) with very satisfactory results. But ultimately you are trying to keep a glorified greenhouse heated or cooled which will obviously use energy
 
Will look into the electric convector, main goal as said is to frost protect and be able to warm up when want to use.
 
Is advise a turbo (fan assisted) type. Makes a world of difference over convector only
 
those heaters are rated at 2.5Kw & 3.0Kw an air conditioner would give you 3.0 Kw of heat with just 800w input
 
that dimplex one works very well, i put one of those on my mums con-wall.
it heats the lot in 10 mins.
 
those heaters are rated at 2.5Kw & 3.0Kw an air conditioner would give you 3.0 Kw of heat with just 800w input

How does that work then. Have they rewritten the laws of physics.

800w in = 800w out.

1st law of energy. It can neither be created or destroyed - just transferred.
 
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I take it under floor heating is a no no… does that work on a thermostat is that expensive to run keeping above 5 degrees.

I am looking at the turbo Dimplex rad but misses asking about under floor heating.
 
Id forget about underfloor. Easily the most expensive option but I suppose its horses for courses and what you desire.
 
I take it under floor heating is a no no… does that work on a thermostat is that expensive to run keeping above 5 degrees.

I am looking at the turbo Dimplex rad but misses asking about under floor heating.

Any electric heater will work and will be cheap to buy. Underfloor heating works well but not for short periods i.e. on or off . don't forget about the summer which is when most people use their conservatory that it will be unbearable without air conditioning. don't spend (waste) money having a radiator fitted as it will take far to long to heat unless it is big enough and the heating is on long enough. I am not trying to sell my advice is from my own experience. ps I do not install air conditioning
 
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Any electric heater will work but some will work very well compared to others.

For example look at the heat curve of an oil bath heater compared to a fanned convector.
Both could be 3kw. But the oil one wont feel like it.
 

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