I got one of these 3.18gpm automatic heaters from a warehouse deal. A white one if that makes any difference. It is in Fahrenheit rather than the Celsius that would be expected from prior reviews.Not sure of the other changes, but I can also say that the blower fan is at the top of the unit just under the flap valves. I believe the combustion blower was at the bottom on the earlier units.I've yet to see if it has low temperature protection in this model, but I doubt it. I will be adding a thermal switch inside that starts up the blower fan whenever the internal temp drops below 40. It should run here and there drawing warm inside air through the device occasionally all winter.I've only hooked it up to test it then put it away so far. I am not at the stage with my tiny house to install it yet, but I couldn't pass up the warehouse deal and bought it the moment I spotted it since this was the unit I was going to use anyway.In my initial testing, the only thing I would consider a flaw is that you need quite a flow to make it start up. I would like if it started at more like 0.3GPM rather than almost 0.7. That's a lot of water for me. I use 0.5 GPM on every fixture, even the shower even though I have unlimited well water.The blower makes a bit of noise, and there is an audible clink as the flaps shut when the blower powers off. No big deal, not as loud as a typical bathroom vent fan. For me this will partly double as the bathroom vent on my wall. Something to pay attention to is that most houses are in a negative pressure during the winter. Especially down low in a basement. Those who use this in the winter and have it freeze may be experiencing cold air being constantly drawn into the unit past the flaps because their house is leaking warm air above. Something like a chimney wastes a TON of hot air which has to come from somewhere.I was able to turn the flow rate up very high before it couldn't hold 120*F anymore, at least to me given how little water I am used to. For sure this thing will be able to give you at least a pleasant shower or one large warm water task at a time even with a feed temp of 33*f. The real limit will be getting it to actually start with the lower flows needed for that. I'm sure that it will do at least 1GPM even in those extremes though. Didn't do the BTU/hr calculation for the water volume and temperature. The 3.18GPM will assume a more reasonable feed temperature of course.Speaking of BTU this claims 80k BTU/hr. I don't know if that's the gas consumption rate, or the actual thermal output. Assuming it's thermal, the gas rate is probably more like 96k. This means that the heater will run maxed out for 1 hr per gallon of propane, or about 4 hours total on a 20lb tank that is full at absolute max flow rate. Ultimately this means that it should last quite a long time for a family taking average showers. LPG has 95,500BTU energy per gallon.This is also reaching the limits of a 20lb propane tank especially if it's cold. When propane gas is drawn from the tank the remaining liquid propane boils to replace the gas consumed. This lowers the temperature which then changes the pressure coefficient to be lower. Eventually it will get so cold it cannot boil enough to maintain pressure. This heater could freeze a 20lb tank like that at max flow.I will come back and update this when I eventually have it installed, then again when someday it fails as all things do. hopefully it remains a 5 star review either way.Final note, take a close look at the measurements. This thing is HUGE if you're used to the D battery ignited ones. It's small for what it is, don't get me wrong, but I was caught off guard by it slightly because I never even looked at the dimensions of it. Not negative at all. Just an observation. I assumed the output pipe was 2", so in my head the device was going to be some 30% smaller.Our house has a small apartment where we live. We've been running the heater for about a month now and it's just what we needed. The plumbing here is impossibly tight space-wise, so this was the perfect solution. The heater fits on our kitchen wall. (Inside) It's set to 120 degrees and heats it up in a few seconds. We live in a northern climate so we'll see how it holds up during winter. One other thing, a wall thimble is required for the exhaust pipe on this heater, which is an odd size. The company makes the proper size but it's not included when you buy the heater so be sure to pick it up as well.If your plumbing is 3/4 inch like mine, you will have to use adapters because the water heater is all 1/2 inch. Made the installation a little more difficult and another place for potential leaks, but that's small stuff and easy to overcome.The exhaust is also smaller than standard. If you are going to vent horizontally and use the supplied pipe it's not a factor. If you are doing a replacement and using the existing vertical pipe you will need adapters and a little bit of creativity. The installation is a little bit tricky because of these issues but not a huge problem.The water heater itself is great! Before, I was constantly having to adjust and add more hot water to keep my shower hot enough. Shower time was limited by tank size, and there was a lag between everyone getting a shower waiting for the tank to heat up. Now I set the temperature and forget it. I can shower and shave without having to rush, and the family can cycle through quickly and get on with our day.It's a little bit louder than I was expecting. Nothing obnoxious, I just didn't think about that aspect. Not a problem, just throwing it out there for anyone like me who didn't think about that.For the price it's a great upgrade from the ancient tank type heater that it replaced.We bought this to use in our temporary shower room while we build our house. My husband is pretty handy so he had it up and running in no time. It created enough hot water that everyone can shower in a row (there are 4 of us) and we have never run out of hot water. We also use it to wash our laundry. It is a little pricey but you cannot put a dollar amount on comforts and daily showers in the summer while building a house are an absolute necessity! 5 stars!Hot water, all I want, at the touch of a button!!Great product! Super value for the moneyAfter installing tweak your mixing valve on your shower as your hot water pressure will now be different. Also be aware running your sink while showering may be a problem so look into a low pressure shower head it definitely helps or a blast of cold water when someone uses the hot water while showering will be inevitable. But overall I'm very satisfied. My house has 3 sinks 1 shower 1 dishwasher and washing machine obviously I don't run them all at the same time but I'll never go back to a tank water heater & my Gas bill has dropped dramatically. Went from ruffly $80ish a month in the summer to $40ish a month. It literally is paying for itself.Arrived quickly and well packaged. Installed at the cottage last week. Took a few hours because I was being careful to go step by step, but it works just fine and setup is very straightforward once installed. Instructions are very limited, but it's relatively intuitive to connect to a propane tank. But, this is a very basic package, with a small bag's worth of parts - each hookup is unique, so you have to figure out what you need.We used pex piping, so needed to buy adaptors for that, and we needed to buy the propane hookups. None of this was a surprise and it wasn't hard, just be sure to use the provided O-rings to ensure a snug fit and no heater leak.Solid product, hope it lasts. Would recommend for small applications. Have noticed it struggles to mix hot and cold water (it needs to be one or the other), and the instructions do recommend that you don't mix - that might affect how you use it.Hooked everything up properly and perfectly with good teflon tape on all connections. Leak free. Good water pressure water flow. Good gas pressure (full bottle and verified by a pressure controlling regulator). Unit tried to fire up twice, then dreaded E1 error. Tested many times in the few ways possible. Same as others have reported. A side note: I've bought a lot of equipment from China over the years and this is the first time I've seen no factory QA stickers on a product. I don't believe these units are factory tested before shipping. Oh, and manual says there's a gas valve on the unit too, but they've apparently ditched this "feature". Buying another brand now.It was installed indoors using manufacturers specifications, it was only in operation 3 weeks when the temperature dropped below -20 Celsius, it froze up overnight, the temperature increased that day while I was work thawing the unit and flooding my basement! I repaired the copper line and preasure tested it before putting it back together but the water had fried the mother board rendering it now useless ?Highly recommend Amazon not making Camplux products an Amazon recommendation. Experienced extremely poor consumer service! Bought this water heater, it didnt work. Other a month of back and forth email chain. And still dont have a functioning unit. Very disappointed!unit starts and runs for a while and then shuts off on its own and alarm sounds that is not good when one is in the shower... sometimes it takes a long time to start ... water pressure is 30 lbs. this unit may be faulty