4 Baseboard Heater Corner Essentials

Ready for a refresh on your baseboard heater covers but unsure about how complicated that will be with a corner in the equation?

Never fear! Replacing baseboard heater corner configurations is not nearly as difficult as it looks. With a little knowledge and guidance, you’ll be in business. Check out these baseboard heater corner cover essentials.


Close up of a 90 degree corner baseboard heater cover installed.

1. Know Your Corners

Not all corners are the same. The first thing to do when you measure corners is know what type of corner you have.

Inside Corners & Outside Corners

Inside corners occur when two walls meet at an angle that points away from the center room. If you go into a square room, all the corners would be inside corners.

Outside corners are where two walls meet at an angle that points into the room. These are often decorative or are transitions between two spaces in an open format room.

Knowing whether you’re dealing with inside corners or outside corners is important because you’ll measure differently and order different lengths based on the type of corner you have.

90° & 135° Corners

The measurement of the angle of the corner is another important element to know before you can measure and order your new heater covers. Most corners are either 90° or 135°.

Corners that measure 90° form a right angle that either points into or away from the center of the room. Most corners in homes or commercial buildings are 90°.

Corners that measure 135° are often used for bay windows, breakfast nooks, or to add visual interest to a space. Unlike 90° corners which make just one turn (and use two panels), 135° inside angles have two turns (and three panels). Most 135° outside angles have one turn (and one panel).

The angle measurement influences how long your panels will be and the type of corner connector you’ll use so it’s important to get these measures right.

135 degree corner baseboard heater measurement guide.

2. Know How to Measure Corners

Getting the right measurements is very important for corner baseboards. It can seem a bit daunting at first, but it’s fairly simple. Our measuring guide walks you through step by step for whatever configuration you have: inside or outside corner, 90° or 135°.

Measuring Guide


3. Know Whether You Should Cut Panels Yourself vs Ordering Custom Cuts

Replacing baseboard heater covers is the ultimate DIY project. You can easily cut them to the right size yourself with the help of our guide. Or, we can cut your panels in our factory according to your measurements for free.

Baseboarders® panels come in standard lengths (depending on the style) of 2’, 3’, 4’, 5’, 6’, and 7’. Order the panel that is larger than the size you need then cut to size.

Watch Step-by-Step Video


Close up of a 90 degree corner baseboard heater cover with corner accessory.

4. Know Which Accessories You Need for Corners

Accessories are made to fit specific configurations. You’ll need different accessories for an inside vs an outside corner set up and 90° vs 135° set up. Most corner configurations will require corner pieces and endcaps. You may also need couplers (for connecting multiple panels on long units).

Pay attention to how your pipes are installed so you can select the correct endcaps. For pipes that go into the floor or into the wall behind the heater, you can order a closed endcap. For pipes that go horizontal through the wall into the next room, you’ll need open endcaps. If your baseboard heater cover fits snug against the wall, you’ll want the zero clearance endcap.

You’ll also order different accessories for different styles. We offer four styles: Basic, Elliptus, Premium, and Premium Tall.

Explore Accessories

A refresh on your baseboard heater panels is the quickest way to start loving your baseboard heat again. Just because a corner is involved doesn’t mean things have to be complicated. In fact, Baseboarders® makes it easy with our library of resources and guides.

Get all the details about corners in perfect clarity with our guides.

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