– Biogreen - 2kW Electric Greenhouse Heater - Adjustable Manual Thermostat & Air Circulation Fan - 2000W Portable Heater 0–60°C IPX4 - Indoor Plants & Frost Protection - Greenhouse Fan Heater

The heater is very sturdy and well made. The fan runs very quietly. I have just started using it to keep my 8 feet by 6 feet greenhouse at a minimum of 7 degrees c. The thermostatic control seems to work very well too. You plug it in, and hold down the on button for more than 3 seconds and it switches on. The ambient temperature is then clearly displayed in big red numbers. If you want to turn the thermostat unit off you just press the off button for more than 3 seconds. I guess these long presses are designed to stop you switching it off by accident. Once the unit is switched on, you set the temperature you want to maintain as follows. Just touch either the up or down arrrow button, and the digital temperature reading starts to flash. Then press the up or down button to change the flashing number. Stop pressing the button once you get to a figure 2 degrees above the minimum you want to maintain. That temperature is then stored. The numbers stop flashing and the ambient temperature is displayed again. In order to maintain a minimum of 7 degs c, I had to set the thermostat to 9 degs. On a frosty evening I stood and watched as the heater quickly warmed the greenhouse to 9 degs. The heater switched off straightaway. The ambient temperature then dropped slowly to 8 degs, and then down to 7 degs. As soon as it reached 7 degs the heater switched on again and pushed the temperature back to 9 degs. The temperature sensor itself is a small black tip at the end of a black wire a couple of metres long. This lenght of wire allows you to place the sensor just where you want amongst plants or hanging down from above. It seems from the instruction manual that you can put the sensor into an aquarium or into soil. So it's all going well so far! I hope the cacti appreciate all this care and attention and flower in the spring! I've just looked at how heating my 8' by 6' greenhouse costs me in electricity over a winter month. It's a Gabriel Ash cedar greenhouse on a dwarf wall, and I have added insulation to the dwarf wall inside, but no extra insulation on the glass. The roof vent area has also been covered off for the winter. My extra electric use from February into March 2014, compared to the same month in 2013, is an extra 3.2 Kwh during the day, and an extra 2.6 Kwh on economy 7 rates at night. I guess it's been a mild month, but I hope that's a guide.

Quick delivery. The heater works very well in a 12 x 8 foot greenhouse. Recommend the thermostat, it works very well with the heater.

This is the best heater and thermostat I have ever used in my greenhouse ( a very lot of years). It is well built, sturdy, reeks quality, impressive right out of the box. The thermostat can be placed remotely where your plants are. I have never had one that works so accurately, I have it set for 7deg, my high low digital thermometer shows a high if 7 and a low of 6.3 less than one degree. These reading are when the outside temperature was under 3deg. The heating elements are not the usual heating wire coils but are two heating rings similar to a hob or kettle elements, everything is well sealed and is quoted to be spray safe, just what I need in my greenhouse. When used with the thermostat and reaches the set temperature the heater and fan stops. I have checked it for over heating of the elements at that point, the body is fixed to slope upwards a little so cold air is drawn up through the tube as it cools, the mesh at the front gets hot but the case remains cold, I can't see a difficulty here as I use it but I am not going to test it up to high temperatures in my green house. As to the cost, worth every penny. For info., my green house is 6X8 situated in a wind sheltered but not frost sheltered area. I use it for over wintering plants and seedlings.

Has definitely kept my greenhouse at the set temperature. I did buy the one with the thermostat and combined with a wifi thermometer it’s proven worry-free over the unexpected recent cold nights. Easy to set up and very quiet. Not sure it’s worth the price but as the first heater I bought was useless, at least I have peace of mind. Appears very durable and is handy that it’s freestanding in my greenhouse.

Don't waste your money on the heater plus thermostat option. The heater's internal thermostat is actually more accurate than the separate digital thermostat and only fractionally harder to set-up than the digital thermostat. You will need a separate thermometer to set it up, but you just need to put the heater in your greenhouse or conservatory when the temperature is below your desired minimum, turn the temperature dial up to full, switch on, wait for the temperature to reach your desired level, then turn the dial down until the thermostat switches off. Importantly, the fan keeps running when the heating element turns off (and consumes only tiny amounts of power), which is (a) better for the heater (see below) and (b) better for your plants. The digital thermostat is hopelessly inaccurate, which means that you still need a separate thermometer, and you need to keep adjusting the set temperature until it maintains the temperature you actually want (which, in my case, meant setting the temperature to a staggering 5 deg. C above the temperature I wanted). More importantly, the digital thermostat cuts all power to the heater when it reaches set temperature, which stops the fan running and causes the heater to overheat, triggering the overheat cut out. Skyelark has already commented that "Possibly the life of the heater is compromised by this method of operation". Well, I can confirm that (s)he is correct: my heater failed after just one month of this brutal treatment! In summary, five stars for the heater, but just one star for the heater + thermostat combination.

This is the second one I buy in 5 years. The old one I thought it’s broken just to realise when I received the new one and read again the user guide it was still working! (It was me not knowing how to set it up on heat mode ha ha) Never mind. The main thing it’s a very good heater and I recommend it.

Brilliant product Works a treat

Arrived days earlier than expected and just as the mercury dropped below 0°C Not set it up yet but I researched this very carefully and this brand is reportedly very reliable, especially the separate thermostat version which I have. KeenGardener were the best seller for price at the time and I'm delighted with their delivery. Well packaged. Just need to plug it in now. I did have power put in my greenhouse as it was built last month in readiness for the cold weather and this specific heater. Happy customer.

I figured this was going to be the best heater to get my grow through winter, I hadnt had the temperature drop to test it until last night, works amazing! Super happy