Thinking of trying a tankless water heater. Have heard different opinions. Anyone have experience with these? Any brand or type better than others?
Yes. I have a Bosch.
It has good points, like you can run the hot water forever.
It also has bad points, like every time you stop the hot water it shuts off, and when you turn it back on there's a delay. So if you're doing dishes you'll get alternate warm and ice cold water.
If the flow drops the burner cuts out, so if you don't have 3/4 inch supply to both the heater and the toilet you can't flush while someone showers.
It probably takes more gas than a tank heater. The tank heater runs on the pilot light 24/7. But the you can take a shower and the burner won't light for 15 minutes. Then it's a 40,000 BTU burner that runs for maybe 15 minutes. With the tankless heater you have a 250,000 BTU burner that runs every time you turn on the water.
You have to run a 5" double wall exhaust pipe if you don't have one. You have to run a 5/8" supply line direct to the appliance. It cost more to install the unit than it did to buy it.
It's small, so if space is a premium it might make sense despite the drawbacks. That's my situation -- made a laundry room possible. Along one 8' wall we have a washer, a dryer, the clothes hamper, and the water heater. It couldn't all fit with a tank heater.