So in addition to possibly replacing our pellet stove. Which I am struggling with based on current offerings. Our home was built with elect. wall heaters. There is one that I might change out to something different if there is some upgraded options. We have never used them. They are 20+ years old. Look like a 6x12 register with a control knob. 220 volt. Is there something new that would be more efficient and put out a good amount of heat for 600 or 700 sq. ft?

What you have is 100% efficient at turning electricity into heat.

You can do 3 things to maybe lower your costs:

1. Better insulate the space.

2. Install a heat pump which uses electricity to pump heat from one place to another rather than an energy conversion from electricity to heat.

3. Change to a cheaper source of energy to convert to heat.

Of course all of those cost money and may not save you anything in the long run.

Electric resistive heating is one watt in, one watt out. A mini split, however, will provide three to five watts of heat for every watt of electricity. You also have the benefit of providing AC in the summer.

About a month ago I installed one that will provide heat down to -12F. It was an 18,000 BTU 21 SEER2 unit that cost $799. It took me a couple hours to install. I installed one a few years ago in one of my basement apartments that has a wall furnace. Since installing the mini split, the tenants haven’t used the wall furnace. It is cheaper for them to heat with the mini than to pay for the gas.

Insulation and drywall.

I would get rid of them and repurpose the electrical connections in the main box giving you more open slots for future power additions, or convert the 220 to 110 and install an outlet if you need on there.

I agree with a mini split, if it can circulate in all areas of the 700 sq ft.

Benefits besides what is already mentioned is humidity removal, filtering and circulation of air and any/all potential risk of the pellet stove.

If it otherwise is not contrary to your situation. (extreme cold being the biggy)

Why would you replace or remove it, if you never use it?

orc, there is nothing new inside wall heaters. New covers, digital controls and sometimes quieter fans are all that is offered.
Better (cheaper to operate) is heat pump technology in some form. It will still need backup heat in really cold temps.

ok, thanks guys. I appreciate the info. Our little house has no duct work at all. Was built with elect wall heaters. The house has high open ceiling and is not that great in terms of keeping heat in or out. Not terrible but not great.
The pellet stove has been our primary heat source. Runs 24/7 during winter. We do have a Rinnai propane heater which is great. Use mostly in the fall and spring. And if we great a really cold spell to add supplemental heat. But it is not a good source by itself during winter.
Our pellet stove is shot so trying to determine other options. A mini split is something to consider but not sure how it will do as a primary heating source during our long and cold winter season.
The pellet stove is good because it constantly provides heat all the time.

There is one primary wall heater that "could" supply heat to the living area. The location is more in the kitchen. There are other wall heater in the bedrooms and bathroom.
A woodstove is not a great option due to a window placement and high pitched roof.