AQUAH PLUS DIRECT VENT LIQUID PROPANE GAS TANKLESS WATER HEATER 10L / 2.7 GPM

We researched this for quite a while and found very little that is competitive with this device at this price point; all the the cheaper models are designed just for shower use and do not have the same level of automatic operation - we wanted something at our remote cabin that worked just like the kitchen tap at home.We installed this just a couple of weeks ago at that off-the-grid mountain cabin, which uses a 1,500 gallon cistern, an automatic 12VDC pump, and a pressure tank upstream of this unit. It was a day-long installation but that is not the fault of the unit itself, just the associated plumbing and routing of the propane line as well as drilling the vent hole through a log wall. Once installed operation is completely automatic: when we turn the hot water tap on it starts automatically and within 15 seconds we have water at the desired temperature, which you set (and is displayed) on the front panel. It is superior to the cheaper units where you can only vary the propane flow and the temperature will vary according to flow rate - that may work fine for a shower, but not for a kitchen sink where you may be blending hot and cold water at the tap - the temperature this puts out is constant regardless of flow. We are using a half inch propane line and aren't having any problems.I would give it 5 stars if it could work with 12VDC as well as 110VAC - in our small cabin this is the only device we have to invert for - even our refrigerator ( Grape Solar GS-UF-5-Fab1 Glacier DC/AC Fridge/Freezer, 5 Cubic Feet ) runs on 12VDC. Yes, there are other natural vent units that run using a pair of D batteries, but we wanted to avoid putting a vent pipe through the roof and this comes with the wall vent included. The distributor in the US (GNK Enterprises in Ohio - the unit itself is made in China) says that it only consumes 2 watts on standby and 10 watts when running - we haven't verified this yet)The real test will be getting through the next winter - this is a weekend/vacation cabin only and last winter the indoor temperature went down to 14 at one point (the low outside was -14). Our challenge will be to successfully drain the unit - we turn off the power and propane when we leave the cabin and drain all of the water lines, and therefore won't be using the freeze protection feature - there is a drain valve that we will be using instead.I'll update this review every few months if anything changes, but so far so good!Updated July, 2016We made it through the winter without issues - and the low temp inside our cabin where the unit is installed reached 18 F. The "drain" plug on the unit isn't really a drain, but an air intake that allows the unit to drain through the water lines. Or at least that is the case for us because we have this installed higher than the sink it is connected to - if you installed this at a lower elevation (like a crawl space) it might well turn into a drain. But in any event it drained perfectly and did not freeze and still works perfectly.