This is going to put out a miniscule amount of heat. Candles are probably one of the most expensive energy sources. Here is one comment:
"This will radiate heat at about the heat output of a candle (80W according to wikipedia [1]); so you'd need 6 to make as much heat as a 480W electric heater. But this is r/frugal, so let's take a look at the costs:
From wikipedia a candle has 80W of heat output. [1]
From this seller [2] you can get tea candles with 4 hours output for $0.0708 each ($0.0875 with shipping).
Although the above statement may be true if heating a home or even a room, the people on this forum, I think, are interested in heating a van. When costs were calculated comparing candle heat to electric heat one must include the cost of the heater as you did the cost of shipping the candles.
So the total kWh per candle is 80W * 4hr / 1000 = 0.32 kWh
For a cost per kWh of heat of: $0.0708 / 0.32 kWh = $0.221/kWh ($0.273 with shipping)
Compare this to an electric heater. 100% of the electricity is converted to heat, so you want to look at your marginal price per kWh (how much you pay at the highest tier you're paying for electricity at).
[3] has the average electricity price by state -- only in Hawaii (at $0.363/kWh) is the candle heater frugal on the average. On the other hand, if your electric bill pushes you into higher electricity tiers in the winter, and you're paying more than 22.1 cents per kWh (or 27.3 cents with shipping), then this may be a good option. But you may want to look into some other energy saving measures while you're at it.
tl;dr: This heater would cost roughly 22.1 cents/kWh to operate, making it more expensive than electric heat for most people."
