Best Of

Use hard pipes or copper from the boiler to the pump location. That should be enough to hold the pump in place. Don't ever put a pump, or any other hydronic accessory like air scoops or flow check valves between 2 pieces of PEX tubing. It is not designed to support the weight of anything. You will surely see sagging and eventually develop a leak or even separation of the PEX from the fitting it is attached to, over time. Besides it looks so amateur and screams "I have no idea what the H*** I'm doing"

If you work on cars for any length of time… you either have or will lose a half inch or 10 mm socket somewhere in there…

bring one of these

or one of these

Hi, A lot of good stuff has been said, but I'll chime in with some tidbits anyway. 😉 You'll be in a much better position to judge the value of a business after you've been self employed and doing the work for a handful of years. The most valuable part of what you get in buying a business is the client list, but only if the old owner knows how to make his loyal clients, your loyal clients. Clients become loyal clients after you prove that you care about them. I don't know who better than you to do that. Specializing is good, if there is a large enough population to work with. For example, I'm the water heater guy in my area. The other plumbers refer that work to me and I refer all other work to them. It's usually non-emergency, so I have booked work three months out. It's all word of mouth. Just possibly, an organically grown business like that will let you learn the nuances of the trade and the business while growing, which seems a less stressful approach than jumping onto that fast moving train. There's a LOT of experience here, who's willing to help.

Yours, Larry

Don't forget, most mom and pop outfits had longstanding, one on one personal relationships with their plumber. You're not that guy. Many of those clients will just go elsewhere....The only times Ive seen this work successfully for the buyer, is a gradual 5 year transition working alongside the seller everyday..."My nephew is taking over." Mad Dog

1. You are purchasing an income stream. If the cost of that income stream is more than the actual income you are expecting, then it is not worth the price. (maybe over a few years to recover the investment) This would include the phone number, customer list and service agreement payments that you need to honor for the remaining months until you can collect the renewals yourself.
2. You are purchasing durable tools and equipment including: trucks, tools, job-site trailers, pipe threaders, copy machines, file cabinets, and all sorts of things needed to operate the business. All these items have been depreciated on the books and depending on the age of the equipment, may have no real value accounting wise. So 10 cents to 50 cents on the dollar for most of those items is fair, and rolling stock has a blue book value. You are paying the wholesale number, not the retail number. The seller is like trading in the vehicles and you are the car dealer. You don't pay retail for that stuff. What could the seller get it he was trading that stuff into a car dealer?
3. You are purchasing inventory. If there is new equipment like boilers, heat exchangers and water heaters, and they are less than 2 years old, then you can sell them as new and can afford to pay 50 cents on the dollar. Small parts like relays, circuit boards, controls and thermostats, then those are 10 to 20 cents on the dollar. Many of those parts that are over 2 years old are something that you may sit on for 10 years and never be able to sell to a customer. You want to get those inventory parts down in value to something you really don't want. Many items can be purchased as needed with internet suppliers shipping the next day. So having a large parts inventory over and above what you may want as truck stock is really an expense you want to keep as low as possible.  My inventory when I sold my company was in the books at the price I paid for those items and not deprecated.  You need to discount that number based on what you can expect to sell within the next 2 years.  
4. Real Estate or location rental is to be negotiated based on the size of the business and your existing location. Is this going to provide you with an affordable answer to growing your business that you may have been running out of your garage. So that must be considered.

With all that to consider, you need to look at the books and tax returns for the last three years to determine if you can get value from what you pay for the business.  

at 21 & 23 I don’t see enough experience to run a business and hire employees much less spend money you don’t have.
do you have a business plan that the bank will want to see?

Know the cost of Workman’s comp, liability insurance, vehicles, tools on and on.