I bought a name-brand mid-range ($300) hammer drill to drill a few dozen holes in concrete, some with a large bit for lengths of 1/2" rebar that were to be epoxied into the holes and serve as reinforcement for an extension to the slab, others with a much smaller 3/16-inch diameter for "tapcon" style fasteners.

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The drill bit will get too hot when the drill speed is too high or too much pressure is used when drilling. To keep the drill bit cool reduce the drill speed and/or pressure (push) from the drill operator.

What the impact does is to make drilling much more efficient in stone/concrete. These materials are resistant to cutting, but are much less resistant to impacts, they are fragile.

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Drilling a deep hole in a hard material, you may still benefit from getting the drill bit out once in a while and cooling it by air or water. Or you can use 2 or 3 bits with a different length and change them as you progress deeper.

Your assumption is incorrect. The impact is what does the drilling, like a micro-chisel. The rotation merely removes the dust, and ensures that the impacts create a circular hole. This is for concrete/brick.

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In theory, drilling a hole through concrete, bricks, and ceramic tiles needs a large power impact drill with concrete or ceramic tile bit. I googled, impact prevents drill bits head from wearing out due to high temperature. Since the problem is wearing out due to high temperature, can I use a brick or ceramic tile bit at a regular hand driller without impact function, to drill slowly and manually and repeatedly cool it by like putting it in water?

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It is still possible to drill holes in concrete with a regular plain rotary drill with the proper carbide tipped drill bits. It takes a lot longer to drill this way and the hole often ends up larger than intended because of the tendency of drill bit tip to wander around when pressure is applied it. The drill bit can indeed get hot but I've never actually seen the drill bit get so hot as to melt. Far more likely the end of the drill bit is going to wear away due to abrasion.

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I have drilled lots of holes through the concrete with a regular drill without any hammer action. This action is a luxury, a serious one (way easier, no need to pres hardly, the hole diameter is more predictable and correct). But this is not a requirement.

Tapdrill sizechart

A "Diamond" tip drill bit could also be used, but any impact action will damage it & it MUST be kept cool with constant application of a coolant. Such drill bits are more costly & gentle pressure is best, allowing the diamond bit to do the work, not your muscles. Diamond bits get more expensive as they get larger.

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Long before impact drills were available to the residential customer usually due to their high cost, a novice or home owner could replicate the actions of a "hammer drill" by starting to drill a hole in concrete with a concrete bit and if gravel was encountered, a center punch was used to crack the gravel. At that point the drilling could continue.

And yes, you CAN drill a hole in a stone/concrete/tiles by a rotary, non-impact drill. I did it few times when an impact drill was not available. Sometimes it is faster to leave the drill alone and hammer the drill bit against the wall by hand.

Of course, you need a concrete drill-bit, not the one intended for wood. The intended purpose of the bit should be written on the package.

Drilling through any type of concrete without an impact drill will fail as soon as the bit hits a piece of aggregate. You may get away with it in soft brick/breezeblock, but I wouldn't recommend it.

There would be nothing to stop you from repeatedly removing the drill bit from the in process hole drilling operation and cooling it with water when using either the impact driver or the regular electric drill. In fact you could even have a small stream of water running at the hole being drilled to help cool the bit.

All drill bits get hot. The energy you get from the power cable ultimately ends up as heat, only a tiny fraction is actually used to tear the bonds in the material. (Sir Benjamin Thompspn discovered the mechanical equivalent of heat exactly by boring.)

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Having a way more efficient drilling method you finish drilling faster and the drilling bit gets out of the hole, so it can start to cool down.

After drilling four 3/16 holes 3 inches deep spaced about a minute apart with the drill on the hammer+drill setting using the manufacturer's SDS-Plus carbide-tipped hammer bits, the bit seized up on the next hole, and I couldn't get it out. When I was finally able to work it out of the hole, the tip was badly deformed, looking as if it had melted. So I learned that it's very important to keep these bits cool.

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The first holes I drilled in concrete used an impact-only hand tool, with a hammer. It's the impact that breaks the bits of gravel that give rotary-only drills such a hard time.

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An impact drill produces very frequent low energy impacts on the drill bit. An alternative is a pneumatic hammer (usually with SDS+ bit holder) which produces less frequent but higher energy impacts on the drill bit. The difference is impressive - the pneumatic hammer drills concrete much, much faster, even the very hard concrete. The impacts crash the concrete and rotating bit yields you a neat round hole and removes the dust. The bit in a pneumatic hammer may easily get very hot and even lose its properties because of overheating if you don't cool it in between drilling.

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Impact drills are used in concrete and stone, with the appropriate drill bits, because they drill faster by causing micro fractures of the material surface and thus easier removal. The drill bits can get rather hot in the process.

It was made by Rawlplug, called a Mason Master. Very slow. You can still get them new, and there are few vintage ones on fleaBay.

Yes it can be done, though damage to both the bit & drilling machine may occur. I recommend using a "masonry" bit. It will have what look like small paddles on the tip & will work with or without an impact driver. Coolant is always a good idea, preventing damage to the work, the tools & preventing breathing the dust created by drilling. Just as in the consrction field a concrete saw is used with a constant flow of water & the operator wears a facemask, inhaling the dust can be extremely harmful.