Quick Answer
It is romantic, but book one is better known for slow burn than for strong explicit spice.
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This book is not high-spice in an immediate way. It is much more associated with slow-burn tension, longing, and relationship buildup than with early explicit payoff.
If you are comparing it with ACOTAR or Fourth Wing, the most useful expectation is that book one feels slower, milder, and more buildup-driven than heavy adult romantasy heat.

It is romantic, but book one is better known for slow burn than for strong explicit spice.
It is much more romantic than spicy in its first-book reading experience. The main appeal is tension, longing, enemies-to-lovers energy, and fantasy romance buildup rather than fast heat.
For most readers, it lands in the low-to-low-moderate spice range in book one. The story is usually discussed as slow-burn fantasy romance rather than spice-first romantasy.
It is best understood as fantasy romance, with fantasy carrying a lot of the weight early on. The worldbuilding, politics, and larger saga arc matter as much as the slow-burn relationship.
It is usually treated as adult or New Adult-leaning fantasy romance, though the first book still feels more restrained than many adult romantasy blockbusters.
Compared with high-spice romantasy, many readers would call it relatively restrained in book one. The romance is real, but the payoff is slower and less explicit at first.
For most readers, Spark of the Everflame is low to low-moderate spice rather than truly spicy in the heavy adult-romantasy sense, especially in book one. If you want slow-burn chemistry and fantasy stakes, it is likely a strong fit. If you want immediate heat, it will probably feel mild.
Not for most readers in a high-spice sense. It is usually better described as slow-burn fantasy romance with low-to-moderate spice in book one.
It generally lands in the low or low-to-low-moderate spice range early in the series, with more emphasis on buildup than explicit payoff.
Compared with high-spice romantasy, it is relatively restrained in book one.
It is best described as fantasy romance, with worldbuilding and saga structure carrying a lot of weight alongside the slow-burn relationship.
It is usually treated as adult or New Adult-leaning fantasy romance rather than straightforward YA.
Most readers would expect book one to feel milder and slower-burn than ACOTAR.