That's an apples vs oranges comparison since the number of Europeans dying from heatwaves are statistical deaths. This excess mortality is determined by averaging the number of people who usually die during the Summer months and then checking if that number went up during a heat wave.
But what it really means is that the bodies of very old and frail people who were already on the brink of death gave up slightly sooner than they normally would have. If there had been no heat wave these same 90-year olds would have succumbed after a cold. Not because the heat was truly unbearable or that virus was a real killer, but because their bodies couldn't take ANY hit to the system anymore.
Europe supposedly has 60,000 to 175,000 deaths per year compared to the US with just 1,300 to 2,300 deaths per year. But that's because the US and EU don't use the same methodology,
In the US a heat related death (like a heatstroke) is determined by a coroner or a medic only. It's an official cause of death. Those European numbers are based on statistics, not individual medical examinations. The reality is that the number of Americans dying from heatwaves is enormously underreported.