It’s not just important to keep us warm, you know – your plants also need to be kept safe from the cold too! In order to make sure that your seasonal plants are kept nice and warm as it gets colder, a greenhouse heater is a must-have.
The only problem is that there are a lot of greenhouse heaters on the market and it can sometimes be tricky to know what to look for when on the hunt for a new greenhouse heater, and also what heater is going to be the best possible option for you.
Thankfully, that’s where we come in. We’ve written this article to help you find the best possible greenhouse heater for your greenhouse.
This article includes both a ranking of our favourite greenhouse heaters, in addition to a handy buyers guide to help you to know what to look for!
In a hurry? This heater is pretty hot on the market right now!
In a hurry? This is our winner!
Best Greenhouse Heater – Comparison Table
Best Greenhouse Heater – Reviews
Best Greenhouse Heater – Buyer’s Guide
After covering our favourite greenhouse heaters, it’s now time to go into what it is that makes a good greenhouse heater. Of course, great quality is paramount – you don’t want something that’s inefficient, nor do you want something that isn’t durable enough to withstand the test of time. You should also be making sure that the heater you buy isn’t going to provide more heat than you actually need, as this can overheat the plants causing them to wilt.
Read on to find out more in depth information about what you should be looking for in a greenhouse heater.
The heater you buy is going to depend on how much space you need to heat. Of course, if your greenhouse is already insulated then you’re not going to need to use as much heat because the insulation will ensure that it stays inside. The more space you have and the less insulation you have, the more power you’re going to need to run the heater. Before you look for a heater, check the dimensions of the greenhouse and then measure this up against the output of power of the unit you’re thinking about purchasing. It’s possible that you may require a number of units to properly run your greenhouse. In order to make your heating more efficient, it’s worth ‘bubble wrapping’ the walls and roof too.
There are a few main types of heat sources available when it comes to heaters, and they will all impact your bills in some way. Here are the main ones you’re likely to see when on the hunt for a greenhouse heater:
When you imagine a traditional heater, you’re more than likely thinking about a paraffin based heater. These heaters run on paraffin, and they don’t need a lot of maintenance. In addition, they emit C02 which helps the plants to grow healthily. Thankfully, if you are able to buy one of these heaters at a decent price outright, then they will be fairly cheap to run, and you don’t need to worry about excessive costs at the end of each month.
The main issue with paraffin-based heaters is that they need to be manually turned on and off. If you don’t turn them off and you don’t have anyone to control them, then the heater will continue to run until the fuel is completely depleted. You may also experience some mold because of the water they create. For the most part, you’re better off getting a paraffin heater to make sure frost doesn’t get into the greenhouse, you’re best suited to a different option if what you’re looking for is a heater to keep the greenhouse regulated in temperature.
There are an abundance of electric heaters on the market at the moment. One great thing about these heaters is that they save a lot of energy because of their thermostats. When you set the temperature to its required level, it doesn’t use up the electricity until it’s needed. In order to make them work properly though you will need to ensure that they have some water protection, such as IPX4 or IPX6. This will ensure that the unit can still function regardless of how dense the air is with water. There are a number of subcategories under the electric heater too, such as ceramic heaters, convection heaters, infrared heaters, and more.
You may be best suited to an electric heater that has a fan. These heaters remove any extra moisture in the air that can encourage microorganisms to grow. It’s possible to leave them standing on the ground or you can mount them. These are definitely a good option for a greenhouse.
These types of heaters are run using propane gas. They are easy to access so they’re generally quite cheap, and they make a lot of C02, which is vital for photosynthesis. The main problem with this is it produces a lot of moisture if you don’t regularly check on it. You will need to ensure that you are consistently replacing the propane bottles or the unit is going to stop working. On the other hand, they are also very cheap to run so they can be useful if you’re on a budget. They don’t tend to come with thermostats though.
The other main thing to consider, other than the size of the greenhouse that you need to heat, is your price range. This is going to affect what kinds of things you are going to be able to access. The most basic models will naturall provide the basic features, but you’re not going to get quality as good as what you would get if you spent more money. The models that cost more money generally tend to have better features are are usually able to heat bigger spaces. You can get something on even the smallest budget, but it all depend on what it is that you require.
It’s very important to check the power rating of the heater you intend to buy. For the most part, the output is measured in kilowatts. The amount of output it is able to provide will determine what heater will be right for your greenhouse space. The vast majority of heaters range from around 1kw to 3kw in power. The higher this measurement of power is, the more heat it’s going to produce. You should first ensure you know the coverage you need by measuring out the area that you will need to heat, and then compare this to the rate of air flow so you can make sure that what you have is sufficient to heat the whole space. Generally if your greenhouse is already insulated then you don’t need to buy a heater with a higher input. For most greenhouses 2kw models are more than sufficient.
Heaters can vary in the types of sound they emit, so you need to decide straight away how much noise you’re happy to put up with in your greenhouse. For example, if you want a fairly quiet greenhouse then you may not want to get a greenhouse heater with a motorised sound, whereas you would want to opt for an option that is silent in operation.
Some additional things like fans and some other features can make the heater make more noise, so you will need to think about this before buying. Checking reviews is also helpful when it comes to this as it can help you to make a fully informed decision based on what you need.
Frequently Asked Questions
How can I make sure that my greenhouse is properly heated during the winter months?
Greenhouses are pretty fantastic as storing the sun’s heat, but they’re not quite so good during the winter and cold temperatures. There are a few things you can do to make sure that your plants are properly protected during the colder months. To start with, you should ensure that your greenhouse is properly positioned. When you’re assembling the greenhouse, ensure that it is positioned in an east to the west position in length. You will need to make sure that at least one of the ends is facing the south so it’s in the sun’s light. You should try to ensure that the north-facing side is by a wall or a fence so your greenhouse is protected from any direct winds.
Another thing you can do that we’ve mentioned a few times is to use insulation. This helps to make sure that you keep lost heat at a minimum. To insulate, you can clip bubble wrap along the inside of the greenhouse, or you can even use sheet foam insulation if you have a plastic greenhouse.
Make sure you utilise compost too! It’s important to ensure that your plants have the right nutrition, so using something like an organic fertiliser can be helpful. Compost can be strung together within the structure, in a central location, in order to keep the greenhouse warmer too. This is also helpful for protecting the greenhouse from losing nutrients as a result of being exposed to rainfall.