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We have a Bosch 125B-LP tankless water heater that we have been using for about 12 years now.
The output is 117,000 BTU/Hr.
It required a 3/4” black pipe gas line, and is vented straight up through the ceiling and out the roof, approximately centered in the house (not an outside wall).
Our’s uses a small pilot light and igniter. The new ones require no gas to light.
It requires about 3/4 gal/min water flow to stay lit, so you cannot just dribble water out of a sink faucet.
The only problem I’ve had with it is that about every 5 years the LP pilot injection tube needs replacing as the orifice plugs up and the pilot will not stay lit.
I’ve never had it flushed, nor have I ever done any yearly maintenance on the unit.
We can be running the dish washer, clothes washer and both showers without a problem.
It does take a minute to get hot water to the farthest faucets/shower, but after that it’s endless hot water.

The unit cost us about $700 back in 2001, and I’ve put about $100 worth of parts in it since then.

I feel it was quite a good investment.