electronic ignition gas water heaters

I've found some, but need more detail (tank, volume, tankless..)

Look here

Maybe you haven't been looking hard enough, because there are plenty of gas water heaters which don't use the pilot light method of ignition. In fact it is the standard method of ignition for modern energy-efficient models.

I myself have just bought a very good Bosch tankless water heater which has that type of ignition.

Rinnai, A O Smith, GE, all the big players have electronic ignition water heaters.

I failed to mention that I was looking into storage-tank water heaters.

RINNAI makes a tankless water heater with a piezo ignition like on a pilotless gas stove

farmerman, he's already said he wants a storage tank model (see above)