What is the average experience of your trustworthy drain leak repair installation staff or do you subcontract out the construction? Do you hire only licensed and bonded sub-contractors?
When your drains are clogged do you go get the drain cleaner, do you look for a plunger, or do you get out the snake? Don't know which is best? Don't feel bad, most homeowners don't. That's because plumbing can be a complicated subject. For something as simple as a clogged drain just about any of those options will work to an extent. Obviously some of them will work better than others but which one really depends on the clog. For more problematic issues you might want to consider bringing in the professionals.

This around the clock availability leads to the second thing to look for in your rescue personnel. Are they available at all hours? Saying you are and actually local water heater repair service picking up the telephone are two different matters. Do they offer at least two numbers, one for regular business hours and one for after hours? That is what you are looking for. And if they advertise dispatch vans, all the better for speedy replies.
Alright, so what does this actually mean to the consumer? When you get your energy bill, whether electricity or natural gas, it is really made up of 3 parts. One is the supply, one are taxes and the last part is delivery and maintenance. The supply portion makes up about 75% or so of your entire bill. So when you can make a reduction of the supply cost you can easily effect a reduction of the entire bill that comes to you in the mail. A savings of up to 30% overall.
That $70 dollars is just so the service repair man can start their vehicle and make an appearance. Then the home owner needs to tack on the hourly labor charge and most bathtub companies and electrician will not prorate the length of time a job takes. What this means is if the job requested takes one hour and 15 minutes, the home owner is getting charged for two hours. Do not forget the added cost of materials which the repair man will sneak in. Regardless of whether the repair man prorates or not, the customer can count on a minimum bill of at least $150.
Glycol (Ethylene glycol) is the most common automotive anti-freeze but it requires safe handling. Ethylene glycol is a toxic substance that can cause death if ingested. It also pollutes the environment and should never be dumped in sewers or storm drains. Propylene glycol is a relatively recent alternative to ethylene glycol. It's less toxic but it's still a hazard and should be handled with care. In particular, keep both chemicals away from pets and children. Always dispose according to your local hazardous waste regulations. Don't pollute!
Some plumbing companies also offer annual maintenance packages where they would come in once a quarter and take a look at all the plumbing issues. If you get a provider who is offering such a package, it is worth considering. Such checks enable you to identify potential problems and nip them in the bud before they escalate into bigger issues.