Measure the length, width and height of the room in feet. Multiply all three values to determine the cubic footage of the space. For example, if you have a room that measures 12 feet long by 10 feet wide by 7 feet high, multiplying 12 by 10 by 7 produces 840 cubic feet.

How do you calculate radiator size for a room?

Measure the length, width and height of the room in feet. Multiply all three values to determine the cubic footage of the space. For example, if you have a room that measures 12 feet long by 10 feet wide by 7 feet high, multiplying 12 by 10 by 7 produces 840 cubic feet.

How do you calculate BTU for a room?

For example, a 300 square foot room typically requires 7,000 BTUs to maintain a comfortable temperature, while a 1,000 square foot room requires 18,000 BTUs. A simple formula to determine your heating needs is: (desired temperature change) x (cubic feet of space) x . 133 = BTUs needed per hour.

Can a radiator be too big for a room?

A radiator that is not powerful enough will not be able to heat the room adequately, but a radiator that is too big will not only overheat the room but will cost you unnecessary money to run.

How do I calculate how much heat I need for my room?

How Is Your Room’s BTU Requirement Calculated? A room’s BTU requirement is based upon the cubic volume of the space – the height, length and the width of the room multiplied by four (done for you by our calculator) – and what is above, below and besides the room.

What are standard radiator sizes?

• 400mm x 400 mm.
• 300mm x 1000mm.
• 400mm x 1200mm.
• 600mm x 1200mm.
• 600mm x 900mm.

How do I choose radiator size?

It’s recommended that you choose a radiator size that is within a 10% range of your BTU requirement. However, if it is a choice between buying a radiator that is a little on the small side vs one that is slightly too big, it is best to oversize and buy one that is too large.

Does the size of the radiator matter?

If your radiator is too big, it will minimize essential wall space and use excess energy whenever it is in operation. By contrast, if your radiator is too small, it won’t have the capacity to properly heat your space to the required temperature.

What happens if you oversize a radiator?

Radiators and Heating Efficiency If your radiator’s too big, you’ll be wasting energy every time it’s on – and you may be taking up unnecessary wall space. Then again, if your radiator’s too small, you’ll never get the heat output you need to get the temperature you want in the space.

Is it OK to put a sofa in front of a radiator?

It’s not a good idea to place a sofa, or any other large furniture, in front of a radiator. A sofa would block heat from travelling freely around the room, and could suffer potential long-term damage from a close level of heat exposure.

Article first time published on

What is a good BTU for radiators?

BTU guides You will require 1 x radiator or heated towel radiator with an output of at least 1896 BTU. Something like the White heated towel rail 1200 x 600 would be ideal. You will require 2 x radiators with a BTU output of at least 3733 BTU.

How many BTU do I need for a 12x12 room?

Room TypeRoom SizeRecommended BTU12 x 12 room144 sq ft6,000 BTU12 x 24 room576 sq ft14,000 BTU13 x 13 room169 sq ft6,000 BTU14 x 16 room224 sq ft7,000 BTU

How many BTU do I need for a 20x20 room?

Rule of thumb. A 1 ton (12,000 BTUH) unit is doable in the space you want to cool. To handle the hot, humid summer heat of your area, I would increase it to 15,000 – 16,000 BTUH.

How much does it cost to run a 1500 watt heater for 24 hours UK?

Power RatingPer HourPer Week1500W (1.5kW)29.45p 1500W£12.37 63kWh2000W (2kW)39.26p 2000W£16.49 84kWh2500W (2.5kW)49.08p 2500W£20.61 105kWh3000W (3kW)58.89p 3000W£24.73 126kWh

What size room will a 2000W heater heat?

Room Size (Sq Ft with 8 foot ceiling)Watts (Poor Insulation)Watts (Avg Insulation)160 square feet20001750180 square feet22502000200 square feet25002000220 square feet27502250

How big of a room will a 1500 watt heater heat?

A 1,500 watt heater producing 5,100 BTUs can heat 150 square feet. That’s equivalent to a 10-by-15 foot room, an 11-by-14 or one sized to 12-by-12 1/2 feet with a standard 8-foot ceiling.

What's the difference between Type 11 21 and 22 radiators?

The main difference between Type 21 and Type 22 radiators is the layers of fins, also known as the number of convectors. … As you can imagine more is always better so Type 22 radiators typically generate much more heat than Type 21 radiators. This is down to the additional layer of fins inside.

Does a bigger radiator give more heat?

The longer the panel, the larger the heat emitting surface area, so bigger radiators will emit more heat, but also remember that a double panel radiator will emit more heat than a single panel radiator of the same length.

What is a Type 21 radiator?

Type 21 radiators are also known as P+ radiators or double panel plus radiators. They are a conventional type of radiator with 2 panels (front and back) and 1 set of convector fins in the middle usually zigzag shaped which distribute air evenly.

Does changing radiators make a difference?

Modern radiators can be a focal point of a stylish room, with a wider range of styles and sizes than ever before. If you’re updating your boiler then not only can you increase the efficiency with a new radiator but you can also improve your home decor with a designer radiator.

What is the widest radiator?

K-RAD WHITE COMPACT RADIATOR 600 x 2000mm Although we offer over 200 different dimensions in this range, the widest are 2000mm and 600mm in height. The 600 x 2000mm K-Rad Radiators come with a choice of single or double panels and with a single or double row of convector fins.

What happens if my radiator is too small?

If your perfect radiator is too small, it will struggle to warm the room as it won’t be able to produce enough heat. This will place extra strain on the boiler, while also increasing your heating bills as you keep your heating switched on for longer than necessary.

Will a double radiator make room warmer?

The longer the panel, the more surface area there is for the radiator to emit heat. Therefore, a radiator with a double panel of the same dimensions as a single panel radiator will give off more heat, as the total surface area is greater.

Is a bigger radiator better?

When it comes to radiators the answer will depend on your situation, but for the most part, the answer is usually yes. However, there are some instances where bigger may not be better. … While most people look up radiator sizes in terms of their lengths, the thickness of the radiator also impacts its performance.

What radiators give off the most heat?

Aluminium radiators provide the highest potential BTU output possible. That doesn’t mean that every aluminium radiator has a higher heat output than every steel radiator, for example. But aluminium radiators have the greatest heat output potential of any type.

Where do you measure a radiator from?

It is measured from the furthest point at the front of your radiator to the wall. Although this isn’t necessarily vital for replacing your radiator like for like, it’s helpful if you are short on space and need a slimline radiator.

What do aftermarket radiators do?

Since aluminum can be extruded into very thin sheets, newer performance radiators are able to pack more fins, more rows, and larger circulating hoses into a similarly sized unit. More surface area provides more opportunity for the heat from your engine to be dissipated into the air.

Should you put foil behind radiators?

Silver foil placed down the back of a radiator will reflect heat back into a room rather than letting it uselessly escape through the walls of a house. … However, the Energy Saving Trust says that foil behind radiators is not worth doing if you already have cavity wall insulation.

Can radiators start fires?

Water radiators generally will not start a fire because they do not become hot enough. However, fragile materials placed close to or on a water radiator can burn. For example, thin plastic near a water radiator might warp because of the radiator’s heat.

Where is the best place to put radiators in a room?

The best place for a radiator is in the coldest part of the room. This used to be under windows. However, in more modern double-glazed homes, there may not be a cold area, so you can put radiators where they won’t affect the use of walls. A general rule is to have one radiator for every 4m or so in a room.

What happens if BTU is too high?

If the BTU is too high, your room will cool too quickly and that can cause the air conditioner to cycle more often. That places a considerable amount of load on the compressor and can shorten the lifespan of the air conditioning unit.