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Flue pipe joints normally don't need tape if from the heater the male end goes into the female end all the way out. Three screws holding each joint together on single.wall. Unless it's b vent they lock together. If a heater is backdrafting the two water pipes at the top have plastic gromlets...

W: AT MOS VENT“ device look something like this. Take a.pic https://www.supplyhouse.com/Watts-0590715-1-8-FV4-Auto-Air-Vent-3679000-p?utm_source=google_ad&utm_medium=Shopping_tm&utm_campaign=Shopping_TM_New_users&gad_source=1&gclid=EAIaIQobChMIm7vuyt_-ggMVMAitBh2a4A9FEAQYASABEgLpY_D_BwE

Height from the lowest piping to highest water heat emitter or piping. What tools are needed 50 lb tire gauge, tire pump, flat bladed screwdriver and adjustable wrench.

Any tank would need a man way to install float switches and certain times might need to be cleaned. A added pump would be needed to pull water out of it. Well pump would just fill the tank. Have a sliding door for walkout basement where the doors can be pulled to get tank in or a vertical tank...

Expansion tank is on the wrong side of the system needs to be on the suction side of the boiler pump. Pump looks like it would be easier to move the pump like tacos diagram than to keep the pump where it is and move scoop and extank. Need to know the height of your system for the correct water...

According to the instructions a thermometer should be in mix water piping. These valves regulate by temperature not by percentage. Guess your looking for more capacity just remember the hotter the water the more minerals will come out of the water and more cleaning might be necessary. Here is a...

Pic 47 png last two number ex tank coming off the top of boiler? Can't tell. Lowest piping to the highest height of the water?

Boiler setpoint 150° guess the aqua stat is in the boiler? Which taco controller do u have sr 501? Room thermostats control pumps through the taco control? Using electronic thermostats? Mixing valve to lower temperature for radiate probably won't work with out expensive piping. Most floor...

One of these pilots are more compatible than the one you shown. U will notice some burn left some right some both directions. Spark comes out of the flame rod and so does the ma signal

Boiler short cycles what controls the pumps ,what controls the boiler. What temp in and out do run the boiler and is there outdoor reset? Are there check valves on the two systems? What are t valves going to the baseboards?

Always remove yours pull it apart soak it in vinegar for couple hours or less put it back together with new element. Leave to old one in the vinegar for for more hours clean it. Have a spare.

They use the same spec sheet https://www.zurn.com/search?keyword=-ZW1017XLC

Look at page 103/6 Then 113/ 6, 7,8,9,10,11 see if it's calling for pumps or valves

Contactor buzzing? It buzzes because the contact laminated plates have started to corrode.and rust is when contactor is closed it will buzz. A mercury contactor Sometimes called a mercoid. That can stand up to moisture. Heres just one company...

Page 107 left column #2 toggle between zone -pump zone valve https://www.google.com/url?q=https://fwwebbimage.fwwebb.com/ProductInfo/NCB-H_Installation_%26_Operation_Manual_EN_201130.pdf&sa=U&ved=2ahUKEwj0j5fvifeCAxX_rYkEHf8fBD4QFnoECAcQAg&usg=AOvVaw3rpzAZx-qVUI0-0wMPPcqL

How deep is the well?

Here's a heater that can use in a washdown room. https://www.stelpro.com/en/products/washdown-unit

Look at page 1 #8 and 15 https://cdn.shopify.com/s/files/1/0496/6601/files/DR-239_User_Manual.pdf?v=1644019582

Did u prime the pump?

What control are u using to cycle the pump turn the boiler on? Complete model of boiler ? And some pics of boiler and piping.