Your tech is already standing in the mechanical room, twice a year, six feet from where a softener goes. The water heater the customer complains about is in the same room you service every spring and fall. No trade gets more scheduled, trusted visits to the exact place residential water equipment lives — and no trade already runs the recurring-service model that water treatment fits into.
This is residential, point-of-entry water treatment in city-water homes: softening, whole-home carbon filtration and point-of-use reverse osmosis. It is not boiler or cooling-tower chemical treatment. If that's what you searched for, this isn't your page.
Why the agreement model transfers
Maintenance-agreement DNA. Water treatment's natural shape is recurring: an annual checkup with readings, salt if you offer it, carbon media and RO filter changes on the schedule the equipment documentation gives. That's not a new business model for you. It's your existing one with different consumables. Your CSRs already know how to sell and schedule recurring service, and your customers already expect it.
The seasonal gap. HVAC revenue follows the weather. Water doesn't. Water checkups ride the spring and fall tune-up routes on the same truck roll, and installs fill the shoulder months.
Comfort is the brand. You already sell comfort the customer can't see. Water is the same conversation: you test, explain what the number means in general terms, and offer the category of equipment built for it. The test result does the persuading.
Techs who learn quickly. HVAC techs handle refrigerant circuits, condensate, gas and controls. A metered softener valve is within reach. The new skills — testing, reading a city's water report, sizing — are learnable during onboarding; approved dealers complete product and installation training.
Who makes the plumbing connection
This is HVAC's real blocker, so it comes first, not last. A point-of-entry system is a plumbing connection, and licensing varies by state. HVAC companies that add the line do it one of three ways:
- The company already holds a plumbing license — common in combined plumbing-and-HVAC shops. The water line is an extension of work you're licensed for.
- It hires or cross-trains a plumber-licensed installer. One person who sets systems; the HVAC techs test and the office sells.
- It partners with a local plumber for the connection while owning the sale, the test and the service relationship. The plumber makes the connection; you keep the customer.
Whichever model you choose, verify your state's rules before launch. Licensing varies by state. Plumbing-led shops run the same play from the other side — see how plumbing companies run the water conversation.
Add one line to the tune-up checklist
The tech tests hardness, total chlorine and TDS at a kitchen tap and records the three numbers on the agreement record. That's the whole field step: no pitch, no brochure. Before the route, the office pulls the utility's Consumer Confidence Report once per city for the disinfectant type, because chlorine vs. chloramine decides the carbon media. Our guides on how to test city water on the tune-up and how to read the city's CCR cover the kit and the report.
The CSR follow-up, two sentences: "Our tech tested your water during the tune-up — your hardness came in at the number on the record. Would you like our water specialist to walk you through what that means and what the options are?"
What to offer first
Lead with what fits the room and the test. In HVAC, footprint matters, which is why the one-tank combo is often the first conversation in a tight mechanical room.
| Order | Situation | Product | Sizing |
|---|---|---|---|
| 1 | Hardness on city water, mechanical-room space available | Diamond Soft metered ion-exchange softeners, 30K / 45K / 60K grain, Clack WS1 valve | Softener sizing calculator |
| 2 | Tight mechanical room; hardness plus taste/odor | The Diamond — carbon and softening in one tank | Softener calculator for capacity |
| 3 | Taste/odor on a chlorine or chloramine city | Black Diamond whole-home carbon — coconut-shell or catalytic media per the CCR; 1.0 / 1.5 / 2.0 ft³ | Home flow-rate (GPM) calculator |
| Plan add-on | Drinking water with scheduled filter changes | Reverse osmosis, point-of-use | Per the model's documentation |
Ion-exchange softening is the standard approach to hardness. Activated carbon is the media class commonly used for chlorine taste and odor; catalytic carbon is what media makers specify where a utility uses chloramine. RO is a membrane process for point-of-use drinking water. Describe the categories that way and let the model's documentation carry the specifics.
A first job, from tune-up to service plan
Sample job
One fall tune-up, run as a water job
The route doesn't change. One line on the checklist and one follow-up call do.
0 of 8 checked
Then
Repeat on the next route. The second system is the same checklist with a tech who's done it once.
Run your own agreement-base math
Every input starts blank. This is your agreement base and your prices, not a projection of earnings.
Your numbers · city-water jobs
Agreement base → tests → installs → service visits
Every input starts blank. The math is shown under the result.
Enter all 8 numbers to see your math. 0 of 8 entered.
Your numbers, not ours. This is arithmetic on the numbers you entered. It is not a projection of earnings, income or profit, and it is not a promise of results. “Installed-price total” is your price multiplied by your count. It comes before equipment, labor, financing fees, overhead and taxes, and actual results vary by market, pricing, licensing and effort.
Building the water service plan
The service plan is a set of choices you make, not something the equipment makes for you. A plan can include an annual checkup with readings, salt service if you offer it, carbon media and RO filter changes on the schedule the equipment documentation gives, and a log per system. Put the water visits on the spring and fall routes you already run, so most of them ride a truck roll that was happening anyway — the calculator above separates those from the extra rolls.
One brokerage's view of how recurring service affects what a contracting business is worth appears in the startup economics breakdown; treat it as one opinion, not a promise. Service multifamily accounts? See the multifamily guide for in-unit installs and batched service routes.
The honest questions
How the Aquonyx dealer program works for an HVAC company
- No application, enrollment or franchise fee.
- A one-pallet opening order to begin.
- Assigned wholesale pricing after approval, viewed in the dealer portal.
- Product and installation training during onboarding.
- The dealer portal for quotes, ordering, order tracking, installation scheduling and stock.
- The written dealer agreement governs territory and terms.
- Written Lifetime Limited Warranty terms provided to dealers.
- Homeowner financing: on completion of the dealer application, Aquonyx introduces you to its in-house homeowner financing program.
Weighing a manufacturer against a distributor or a franchise? Manufacturer vs. distributor vs. franchise lays the three out.
Add one line to your fall tune-up checklist: test the water. Apply to become a dealer — no fee, or see the systems first. Aquonyx is the manufacturer; dealers run their own businesses.
This guide covers municipal (city) water and residential point-of-entry equipment. Licensing varies by state; verify with your state board. Equipment is described by type and specification only — the model's documentation states what each system is designed to do.
About Aquonyx. Aquonyx builds city-water treatment systems for independent dealers. You buy from the maker. Articles are written and reviewed by the Aquonyx Technical Team; see how we source and check them.