How to tell if boiler and plumbing installation was done right

“Not a plumber. Is this right?”source ↗

“Is this plumbing job acceptable?”source ↗

“My handle of main shut off valve broke the other day and this was what the plumber who came out did to repair it.”source ↗

“I’m not a plumber and have zero knowledge of plumbing, but this doesn’t look right to me.”source ↗

“Can someone with some knowledge give me some feedback?”source ↗

“Looking for advice, thank you in advance”source ↗

“Hot water is coming quick enough. But the pump seems to be way too hot as in you can’t touch it for more than a second.”source ↗

“Your basement is currently not roughed in for a basement bath at all.”source ↗

“Third time soldering after taking myself. Been under full pressure for 4 days and none have leaked. Should I be confident in covers these up behind drywall?”source ↗

“This weird angle makes me think this is not correct and could cause problems.”source ↗

“In the directions, it says not to create traps or valleys in the line which would trap condensation and block the flow of steam. It seems like this angle would do that. Am I wrong?”source ↗

“Please could someone advise if this looks right? We’re needing to remove old woodwork etc ahead of plastering but have noticed how the condensate pipe (I think it’s that?!) has been fitted”source ↗

“Is this roughed in or do we need to plan for more work to be done to put a second bathroom in our basement?”source ↗

“Does this look like good work? I'm not getting a great vibe from this guy that she hired. Pic attached, does this look like acceptable work?”source ↗

“So, what if they cracked the pipe ahead of the band and applied cement instead of repairing that section of pipe. I would be furious.”source ↗

“That transition looks iffy for sure.”source ↗

“Water heater burst this morning. I suspect this cast iron was the wrong thing for the plumber to install. Is hanging the expansion tank like this okay?”source ↗

“I didn’t think it wrong until just a couple hours ago when I started googling how a water heater is installed.”source ↗

“I just want to know what to look for when the new one is installed.”source ↗

“Please take a look at this tankless water heater install. I’m mostly concerned about the condensation drain pvc pipe angle and that it’s unsupported for the length of over six feet. Any other issues?”source ↗

“Does the drain & vent setup look okay?”source ↗

“This isn’t the type of venting layout I’ve seen before, so I wanted to make sure there’s nothing wrong with how it’s set up.”source ↗

“want to make sure everything is done correctly before putting the subfloor back.”source ↗

“Is this a good connection?”source ↗

“Based on the photos, does it seem like this is a good connection and the work was done properly?”source ↗

“What is not fine is the lower crimp on the lower ball valve: it seems crooked and too close to the end of the pipe.”source ↗

“From this picture that joint does not appear to be properly made.”source ↗

“that wye is 100% backward, your mom's plumber left a time bomb in that trench”source ↗

“Old air handler didn’t have the black pipes curve over the unit like that. Can any licensed hvac technician look at this and tell me what they think?”source ↗

“Had this mini split installed how does it look”source ↗

“What's going on with the bare copper lineset at the *top* of the unit in the back?”source ↗

“Very sloppy”source ↗

“I have no clue about air handlers.”source ↗

“I might be a bit obsessive but is it "badly" put?”source ↗

“Relationship with the builder has not been the best and I'm a bit concerned we made a mistake.”source ↗

“Am I going to look at this for the rest of my life like "This is so bad"?”source ↗

“Sorry, sligthly panicking over here (over tiles, I know...).”source ↗