Just checked all the reviews at Amazon --- and there are some bad ones -- to see what's up. I'm going to append these notes:

1. These heaters are for in-ground pools ONLY. It would be possible to use them on AG pools, but it would be tricky and may void the warranty (I haven't checked).

2. ALL heaters will be destroyed by low pH (< 7.0) or excessive salt (> 5,000 ppm). If you get the heater, you *NEED* to learn the BBB method; you *NEED* the K2006, and you *NEED* an accurate salt test. If you make a warranty claim on the heater, Hayward (or any other maker) WILL inspect for chemical damage, and WILL repudiate the warranty if they find it.

3. Document your installation (photos); make gas connections properly; keep all purchase papers securely.

4. Do NOT order these heaters online, until you are READY to install. Amazon has a 30-day return window. It's easier to return to Amazon, than to get mfg warranty service. Read the manual (of this or ANY heater you buy) BEFORE purchasing. Make SURE you are ready, before you buy. It makes no difference to Amazon whether the 30 days gets used up while the heater is sitting in the garage, or while it's working hard.

5. The electronics are EXPENSIVE, on all heaters. Consider getting surge protection on the power supply.

6. It sounds like the weather protection on the electronics may be imperfect. I'd recommend testing with a water hose and sprayer, to simulate rain, and then opening the heater to make sure the electronics are staying dry. If not, consider making some sort of SS sheet shield to protect them. I'm going to look at the ones I have installed this week, to see how that could be done.

7. Install them properly; no short cuts; no 'it's good enough'; these heaters mix water, explosive gases, and electricity: DO IT RIGHT. Read the manual for info on how.

8. On products like these, manufacturers deal with consumers (and to a lesser extent, pool guys) who make installation errors, damage the product, and then try to make warranty claims. So . . . (a) do it right, without errors; (b) don't be offended if Hayward expects you to PROVE you did it right: it's the price honest people pay for sharing the planet with dishonest people, and finally, (c) if YOU screw up, take like a man, and don't try to rip off Hayward or Amazon.

9. If you're unsure about doing it right, HIRE IT DONE. But . . . remember, if YOU buy the equipment (at a discount) equipment warranty problems are YOUR problem, not the installers. If you want the installer to 'stand behind' the heater, plan on paying your installer maybe $500 MORE than the Amazon prices for the heaters PLUS the cost of installation.