Stelpro Prima ASPRL0502W
#5 in BaseboardFull review
A tidy, low-profile 500 W baseboard for a small bedroom or bathroom, with a long warranty. You pay for the design.
Amazon $126.60$126.60
The Stelpro Prima ASPRL0502W is the better baseboard or wall heater overall, rated 3.2 to 2.6. The Stelpro Prima ASPRL0502W leads on warranty. The King Electric K Series 3K2407 wins on value. The Stelpro Prima ASPRL0502W costs $2.40 less ($126.60 vs $129).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
King Electric K Series 3K2407
#10 in BaseboardFull review
A sturdy 3 ft, 750 W contractor baseboard for 240 V. The short warranty and the higher price per watt hold it back.
Amazon $129$129
Which should you buy?
- Choose the Stelpro Prima ASPRL0502W for warranty (5-year warranty, lifetime on the element vs 1-year warranty).
- Choose the King Electric K Series 3K2407 for value ($172 per kW ($129, 750 W) vs $253.20 per kW ($126.60, 500 W)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every baseboard baseboard or wall heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Stelpro Prima ASPRL0502W | King Electric K Series 3K2407 |
|---|---|---|
| Overall rating | 3.2/5 | 2.6/5 |
| Value 35% | 24 $253.20 per kW ($126.60, 500 W) | 44 $172 per kW ($129, 750 W) |
| Controls 25% | 20 optional built-in thermostat kit | 20 optional built-in thermostat kit |
| Safety 15% | 75 full-length overheat cutout | 75 full-length overheat cutout |
| Warranty 25% | 100 5-year warranty, lifetime on the element | 0 1-year warranty |
Specifications
| Stelpro Prima ASPRL0502W | King Electric K Series 3K2407 | |
|---|---|---|
| Heat | ||
| Type | Convection baseboard | Convection baseboard |
| Rated output | 500 W (375 W on 208 V) | 750 W (563 W on 208 V) |
| Voltage | 240/208 V | 240/208 V |
| Length | 36.1 in | 36 in |
| Output per foot | 166 W/ft | 250 W/ft |
| Heating element | Stainless steel sheathed tubular element with boxed aluminum fins | Aluminum ribbon fin element |
| Maker's heating area | 50 sq ft | - |
| Controls | ||
| Thermostat | Optional built-in kit | Optional built-in kit |
| Selectable wattage | No | No |
| Remote or timer | No | No |
| Safety | ||
| Overheat cutout | Automatic reset | Yes |
| Full-length limit | Yes | Yes |
| Build | ||
| Weight | 8.5 lb | 8 lb |
| Warranty | 5 years, element lifetime | 1 year |