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"Keith came over for an estimate the previous Friday, took one look at our old tank water heater, and let us know what a liability it was.  We were then persuaded to go with a tankless water heater -- I have to say that I wasn't hot on the idea initially due to cost recovery being nearly impossible on them due to high installation costs having to rejigger the plumbing, add electrical, and update the venting.  However, we had decades of code violations which would have added up to a monstrous cost (especially for the vent) to replace with a normal water heater.  The NPE-240A that we were persuaded to purchase uses PVC venting, which is routable through older metal vents -- thus is a cost reduction over installation of new, up-to-code metal venting.
Note that Gallagher will have a promotional first-visit price.  If you don't sign the dotted line to purchase a major service from them on that first visit, the price may increase by several hundred dollars on the next visit.  That is a little bit of a pressure tactic and we would have done a bit more homework had we known of it.  However, in this case, we had a potentially disastrous situation on our hands with that 23 year old water heater and didn't much feel like tempting fate by checking with other contractors for their costs and quality of service.
 After Keith left, I began to do some additional research.  I came to find that flush valves are a huge convenience with tankless water heater.  They allow you to easily isolate the house plumbing from the tankless water heater, connect two hoses to the heater and a pump, and circulate a lime scale dissolving solution (such as house-hold vinegar) to remove the scale from the heater exchanger.  I was worried that the install wouldn't come with these flush valves.  I called Gallagher at 9am on a Saturday morning and asked if they would be installing flush valves.  The initial answer from the on-call plumber was no.  Fortunately, Keith provided his personal/work cell phone.  I called to verify the no answer.  He assured me that the flush valves would be installed (and yes, they were -- and high quality valves too; single ball-valve, cast in Italy!).  Thanks, Keith, for taking my call on your off day.  That saved everyone a lot of grief :-)  So my nerves were soothed and I waited patiently for Monday to get that old, possibly leaking, tank water heater out of my house.
 On Monday, two technicians came out on time (Travis and Chad).  I don't recall which one was the experienced plumber, but one of them was definitely new and needed the experience (we all start from somewhere).  Both set out to do their work and were fairly efficient.
Only one mistake of note was caught.  The lesser experienced technician did accidentally cut a hole through my gas furnace vent cap, believing it to be the water heater vent cap.  The mistake was caught, and some sheet metal was cut and the cap was repaired with some mastic and water repellant stuff.  I don't know if that's code but I suppose I'll find out when the code inspector visits to close the permit... certainly the last thing I need is CO entering the house because the cap was reinstall or repaired incorrectly.
The copper pipes were completely reconfigured, and even shortened (which is always good for water pressure and heat retention).  The PVC outlet vent was installed through the old vent and spray painted black.  It can hardly be seen from the highway.  The experienced plumber ensured that the system worked well at full firing.  He didn't have a Manometer that worked with the unit, so we didn't get our gas pressure tested.  He said that the inspector should be able to do that; should I have made him come back to test the pressure?  Well, it seems to work with the gas stove going, but I haven't had a chance or a cool day to test the furnace plus the water heater and the oven.  Backing up a bit, they did install an outlet into the water heater closet, tying into the bathroom electrical on the other side.
The final result looked nice; the valves were mostly positioned in an accessible way.  The hot water flush valve is a little hard to access with the gas trap in front of it.  But everything got insulated, and a bit of PEX tubing was installed for the condensation line.  That was also insulated, so UV degrading the PEX shouldn't be a problem?   The heater was installed in an exterior water heating closet with a vented outside door.  The condensation line was linked up with the A/C condensation line.  The A/C condensation seems to still make it out.  Bonus that the PVC was extended off my patio, but the condensation does now exit just behind the A/C unit. I've read that the Navien produces somewhat acidic condensation so I'm only slightly concerned that large amounts of condensation could cumulatively affect the A/C metal footings.  We'll see what the inspector says (I'll update this review after that is completed).
Overall, the experience was nice, and we were not bothered too much with the Gallagher membership plan like last time.  The techs were personable and willing to explain what they were doing.  They even let me see what a bad idea it is to have galvanized piping interact with copper piping.  Yuck!  It is nice to get rid of all those corroded galvanized stub outs between the old tank water heater and the main service to the house.  They didn't mind that I was looking over their shoulders the entire time; personally, I hate when others do that to me, so good on them.  The experienced plumber graciously repaired some of the busted out dry wall with some of my left over dry wall, which was great, and helped complete one of my DIY items.  Only other thing that comes to mind is, ensure that the techs clean the cold water inlet filter after testing the tankless water heater.  I had to do that myself (per the install instructions that came with the unit) and it had some debris from the performed work.  The tech did explain how to clean that out as it is regular maintenance for tankless water heaters.  He also let us know that there is an inlet air filter that is easily cleaned.
Good experience overall; a few minor (?) issues cropped up.  I'll update this review when the inspector checks on the work.   The heater works great, even without a recirculation line.  I'm much happier to be serviced by a tankless water heater!

** Update post-Inspections **

After waiting a few weeks, and inquiring Gallaghers about the permit, and then receiving it shortly after that inquiry, we had the City inspector over.  He found that the tankless water heater did not have a properly sized gas input.  He caught the fact that the gas line reduced down to 1/2" somewhere after the house furnace.  For some reason the old water heater and adjacent stove had 3/4" pipe connected to that 1/2" pipe.  The installers did not notice this as a potential problem.  The inspector was concerned that if the house furnace were going, there wouldn't be much left over for the house tankless water heater.  Thus he wrote up the install as needing 3/4" pipe all the way to the water heater.  He also detected a hint of natural gas smell in the water heater closet.  We pointed out that the house furnace roof jack had been damaged and repaired.  The inspector took a look and wasn't so sure that the mastic would hold up to the vent's output heat.  So the jack/bonnet would have to be replaced.

It took one night to get a plumber out to fix the gas leak.  It took 3.5 weeks to get plumbers out here to fix the inspector's red tag items for upsizing the gas line and replacing the vent bonnet.  We had called Gallaghers many times during those weeks and were told they would get the installers in touch with us to schedule repa"

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Blessed Family Electric, a locally owned and operated company that values honesty and integrity in all aspects of our business. Our dedicated team of professionals have over 10 years of hands on experience, to provide innovative ideas and suggestions tailored to your projects. Our services are customized to your individual needs, paying close attention to the details of each project that we are involved with. Please feel free to contact us today!\n\nCash is preferred! \n

"I looked and looked for a company to repair or replace the evaporative cooler for us. This company took on the job, weâ re promptly came out, diagnosed the problems and within a few days weâ re back to replace the unit. All were very thorough and professional."

"Mr. Ferrell came to my home and picked up my dinosaur of a computer...a 2005 Dell Desktop.  For all intents and purposes, it was barely running.  If I was lucky, I was able to check my gmail and sometimes send a response.  Mr. Ferrell picked up my computer on his DAY OFF (Friday) and returned it to me on LABOR DAY.  He said that my computer had over 7,000 viruses on it. It was the most he had ever seen!  What I got back from him on Labor Day was the computer I purchased in 2005, but much better.
Mr. Ferrell installed an ENTIRE new operating system, he upgraded my ram, he re-installed his FREE virus protection.  Mr. Ferrell backed and restored ALL of my data.  And, if that was not enough, he updated my hardware system. And, he charged me $125 which I think is an incredible price due to the fact he gave me a BRAND NEW COMPUTER.
Mr. Ferrell is extremely professional, friendly, and incredibly efficient with his time and your money.  I just started using my new computer this week and I am in heaven.  No more viruses...no more waiting 10 minutes to pull up a website...and no more having to pull out all of my cords out of my modem and rebooting my computer.  I am thrilled with the job that Mr. Ferrell did and I would recommend him to anyone.
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"A pleasant experience from start to finish. The quoting process was a good two-way discussion, and cordial - no pushy salesman telling you how bad Company X or Y was. Just honest, factual, and straightforward. They quoted us a system with the panels, racking, and inverter which we wanted, not what they were pushing. The quote wasn't the best (hence the 'B' for price) but it did offer the best VALUE when we considered the equipment specification and the stability of the company - an important consideration when looking at a system with a 25 year life! The installation was scheduled by our coordinator, Sherry, and the team showed up when promised and got the job completed on time. Quality of workmanship was first rate and the entire installation was done with care, and tidied away before the team left. Permitting and PG&E inspection were all handled by Sherry, and that was also quick and flawless. Overall, the system they installed easily meets their projections in terms of performance, and it effectively pays for itself. We really couldn't be more pleased with NRG Clean Power and have recommended them to friends and neighbors. We'd recommend you give them your consideration if your looking for solar power."

"I'm very happy with the work that was done by Landmark construction and energy crew. At first, we met with Ron that came over and met with us about the issues that we had with our water heater and with the bills that we currently pay for electric. Ron recommended us to replace the bulky old water heater and to install a tankless system that will supply hot water immediately and with the use of less gas. We liked that idea and we decided to go for this project. Ron came over to our house with his 2 people that basically took care of all the removal and the installation of the new system. The work that they did took only 2 days from start to finish and now we have more space at the garage, and the bills are much lower than before…."

"They sell to you a filter to your furnace that is metal that is supposed to be a strong benefit over the throw away kind. This is kind of controversial. You have to take it out and hose it down. I stopped using it on the advice of my air conditioning installer."

"They were easy to schedule with and they came when they said they would. They got the job done quickly and we had no problems with the tinting. It has helped to lower our heating and cooling bill. They got the job done in about half a day. Their prices were very competitive."

"The Technician seem to know his job and seems very experienced in it. He explained why the furnace was not allowing heat to through. There was a part that had to be checked every few years and cleaned. And he did it put the back inside the furnace and the heat started."