Can they push water away from the boiler and expansion and bleeder tank.

Sure.

Don't sweat it. Those small vents are designed to remove residual air (small amounts) in the system. I would imagine your plumber will purge the system after he reverses the circulator. It's a very straightforward process you can do yourself once you've been shown how.

Will they turn the pump or just rewire it?

Turn it 180 degrees.

Not that simple, those zone valves are also directional as are some air scoops. They are going to have to reverse piping assuming the zv's are on return where they should be. Still curious as to what that unit is hanging to the left of the boiler.

Zone valves or circulators can be on the supply or return. Zone valves act as a flow check when closed but don't impede flow in either direction when open. I'm assuming the only issue was the inadvertent reversal of the circulator. Hopefully they didn't short themselves on the wiring if that's the only issue.

Correct they can go on supply or return but return is preferred for ZV's, those Honeywell ZV's absolutely impede flow if installed in the wrong direction. I looked up the piping diagram for that boiler, it shows return connection is on the right side so according to OP the pump is correct, maybe they installed the SS primary header backwards? Seems that unit to the left is a hydronic air handler

That is the Electric 30KW boiler. They took unhooked it now it doesn't work. I asked the boss man yesterday when they were going to fix it. He asked why it was taken apart. I don't know.

Any progress?

I have been on the phone with the office and tech. I think there trying to figure out what they need to do.

What are your temperatures there today?

About 20 years ago, I took over what amounted to building superintendent duties on a 3 story residential structure. Original part was about 100 years old and was heated by live steam. About 50 years prior, an addition was put on and it was heated by hot water radiant heat.........using live steam thru a heat exchanger to heat the water. The commercial furnace guy met me one day to go over the entire system. How it was designed......how it worked. My first impression was it was only slightly more complicated than a nuclear submarine.......but over time, came to realize the brilliance of the system. A mechanical marvel designed and built 50 to 100 years ago by some truly genius minds. Heating guy referred to them as "the ancients".

Fast forward 10 years, in sections where the hot water radiant heat system pipes passed thru......the two upper floors.......got gutted and remodeled one summer. We get into late fall and the heat comes on........yet no heat on the two upper floors. Talked to commercial contractor what did the remodel work and they assured me it was working. Went back to the commercial heating expert and we talk thru it. Long story short, after I (just me) spent two days messing with it concluded that during the remodel, they had cut and capped the circulation pipes. No more loop......only two dead ends. It took me and the commercial heating guy almost two hours to convince the general contractor, his plumbing sub contractor and two architects they had screwed the pooch. Their understanding........and even ability to understand it......was abysmal. It took them nearly 2 weeks and tens of thousands of $ to come back to rip out the finish so they could fix it. Somebody's E & O took a big hit.

My takeaway was if these systems are designed and installed right, they both simple and highly effective way to heat some space. If not, they can be a nightmare to deal with.

My other takeaway was even 20 year ago, the commercial boiler guy was charging about $100 per hour.......probably closer to $150 per hour or more today. If I was a young guy who had a mind for mechanical systems, there is a wide open career path for you. Buildings with these systems in place swill exist and there is a need for experts who understand how to keep them running. A forced air HVAC system is one thing. Commercial rated live steam boilers are something else entirely. Along the lines of brain surgery isn't hard if you know how. Those that know how can make a lot of money.

What they need to do is show up to put eyes on what they did and what they got. They are not going to figure it out somewhere else.

I’m currently an HVAC estimator but was an installer and service tech for many years. That boiler is obviously a condensing boiler (pvc flue piping) one thing I do know about condensing boilers is that they have an outdoor sensor (to change firing rate of boiler according to load condition of home). Was this installed? If so, was it installed where the flue exhaust is actually discharging right on the outdoor sensor? This will prevent the boiler from high firing thinking that it’s actually warmer outside than it really is. I know I saw that you had an oil boiler currently and I just find it odd that a brand new 95% condensing boiler is not handling this load. (You have very minimal heat lost through the pvc exhaust) the oil boiler probably had around 400* flue temp. Your actual boiler sizing drops whenever you installer this high efficiency equipment. That new boiler probably has around a 90* flue temp. I know I don’t like the positioning of that circulator. It appears to be on an angle which will cause that circulator to trip on thermal overload. (Its definitely going to burn that circulator up). I do believe that’s your secondary loop pump. There’s suppose to be a primary pump inside that boiler. Did the 30KW no longer being used heat the home alright? 30,000 watts X 3.4 btu = 102,000btu/hr

Disregard what I said about the circulator. I just looked at the pics and realized the photo was flopped. It is in a correct position concerning the shaft.

The installer never showed up today. There waiting to here back from Navian. I told the worker it's been a week since we had good heat. I talked Navian tech support and he said water should flow to the left. I told him arrow says right. He than told me sticker is on backwards. I said it it's backwards the lettering would be backwards and it's not. This weekend is a high of 6 below zero with lows of 15 below. If we don't have a bunch of electric heater on the house will freeze up.

Yes electric boiler worked good till they took it apart.

I would be wanting some money back for all of the bs you've put up with. I know they were recommended by a friend but they don't sound to trustworthy.

Seems like a total disaster to me!

What happens to an easy propane furnace hooked up to simple duct work?

Hopefully it’s just something stupid that was overlooked. I sold a zoned propane boiler a couple years ago that worked fine as long as the outdoor temp was mild outside. But boy, once it got below 20* my phone was ringing off the hook. It turned out that our installation crew wired the supply and return sensor in the boiler backwards. A screwdriver fixed it in 5 minutes and I was the one turning it. For what it’s worth, it looks like those guys did a decent installation. I’m sure if they call tech support while in the mechanical room, this can be figured out. Those condensing boilers have a lot of bells and whistles in them and if one thing isn’t programmed properly……well, this is usually the outcome. I hope they can solve this for you.

I only asked if the electric boiler worked alright to see where you were size wise. 30KW is 102,000 btu/hr @ 100% efficiency since there is no flue letting heat out the chimney so to speak.

So the electric boiler was in addition to the fuel oil boiler you had? Did the new boiler work when it was warmer outside?

The new boiler could be faulty, I've installed a lot of boilers without issue but the one for my own garage doesn't work as it should. It's plenty big enough but it will never modulate down, always runs at 100% and can't get the water temp over 120, which works for in floor. It keeps the space at temp but runs more than it should, but gas is free so it doesn't matter. I can get it to modulate by slowing pumps down but that throws my delta T way out of whack. I've had the rep there running diagnostics, replaced gas valve, talked to factory, no resolution, it just doesn't do what it should. They hooked my up with there newer model but it's still sitting in the crate. I'm glad it was mine & not a customers but average person wouldn't know since space temp is satisfied.