I am using Delite 6L instant geyser for the past two years in my bathroom. It's great, also has built in safety features to prevent gas leakage. and is working trouble free. Just replaced the batteries a few days back since the old ones were giving low spark. Other than that, it has been maintenance free.
Just some points to keep in mind. You need to ensure that water pressure is not low otherwise it will not turn on, same goes for gas pressure. When peak winter season sets in and gas pressure gets really low, you should turn the faucet down to reduce output of water, otherwise if you leave it on full, water will not be warm enough due to low flame.