Sell Pumps by Duty Point, With the Control That Runs Them

A pump is bought against a duty point, not a part number. The plumber or engineer arrives with a flow and a head. Grundfos's pump selection training defines the target: "Duty Point: This is the desired operating point of the system for the customer." Then the catch: "However, a fixed speed pump will only operate where the pump performance curve intersects the system curve." So the curve, not the horsepower in the product title, tells the buyer where the pump will run. A category page that filters by horsepower and voltage leaves that question to your counter.

When the duty point misses the curve, the fix can be another line on the order. The same module lists the fixes when a pump cannot reach the flow or head: "changing the system, the pump (smaller impeller or different pump), or how the pump operates possibly incorporating a variable frequency drive." Another model, a trimmed impeller or a drive. Each of those is something you sell.

The control is part of what you are selling. The Department of Energy counts it that way in 10 CFR Part 431, Subpart Y. A pump "includes a bare pump and, if included by the manufacturer at the time of sale, mechanical equipment, driver, and controls." A control is "any device that can be used to operate the driver," and DOE's examples include "on/off switches, and float switches." For pumps in the rule's scope, the nameplate carries the constant load index, PEI CL, "for bare pumps and pumps sold with electric motors but not continuous or non-continuous controls." It carries the variable load index, PEI VL, "for pumps sold with motors and continuous or non-continuous controls." Sold bare, or sold by the manufacturer with a motor and a speed control, the same pump is rated on a different index.

The tank and the switch have to agree. Amtrol's Well-X-Trol installation instructions set the diaphragm tank's air charge from the pressure switch. They say to "set the pre-charge pressure 2 psig below the pressure switch pump cut-in setting." Their example is "38 psig precharge for a 40/60 pressure." Pair that tank with a 30/50 switch and the precharge is 28 psig. A storefront that sells the pump, tank and switch as three unrelated items leaves that arithmetic to the job site.

The federal rating has to reach the catalog page. Under 10 CFR 431.465, pumps in the covered equipment classes, manufactured starting on January 27, 2020, that meet DOE's clean water pump definition and are not on its exclusion list "must have a PEI CL or PEI VL rating of not more than 1.00." The scope is specific, down to a "Flow rate of 25 gpm or greater at BEP at full impeller diameter." That makes scope a field a pump catalog needs to carry. For the pumps its general test procedure describes, 10 CFR 431.466 says the nameplate information "must also be prominently displayed: (A) On each page of a catalog that lists the pump; and (B) In other materials used to market the pump."

Replacement does not wait for a quote. A sump pump quits in a storm. A well pump leaves a house with no pressure at the tap. Either one turns a contractor's day into a parts run. The questions are which branch has the unit or its replacement on the shelf now, and whether the control and tank already on site will work with it.

Duty point first, then the catalog. The buyer enters flow and head. The storefront compares that duty point with each manufacturer's curve data and shows the models whose curve reaches it. Uncap's published products do not include pump-curve selection; on Shopify it is built during implementation from your manufacturers' curve data. A duty point no stock model meets, or a selection that needs an engineer, goes to a quote instead of the cart.

The package as one record. A well pump with its control box, pressure switch and tank becomes one package. So does a booster with its drive. Each package has its own price and rating fields. For pumps in DOE's scope, that means the PEI CL the manufacturer rates for a bare pump or a pump sold with a motor, and the PEI VL it rates for a pump sold with a motor and a continuous or non-continuous control. The tank's precharge note is carried from the switch setting. Package records, and the rules that pair a pump with compatible controls, are built during implementation from your manufacturers' data.

Scope and rating fields where they are needed. Each pump SKU carries a flag for whether it falls in DOE's scope. Where it does, the rated PEI and bare pump model number the manufacturer supplies show on the product page and on printable catalog pages. Those fields and their display are configured during implementation. The data, and the call on which pumps are in scope, come from the manufacturer; the storefront displays it and does not make anyone compliant.

On whether a Prophet 21 specialist reads price and stock more directly. The case for a commerce platform built around the ERP is that contract pricing and branch inventory come straight from it. Uncap's published products do not include duty-point selection or pump packages; on Shopify that layer is built during implementation from your data. Integration runs through an owned Uncap Connect app embedded in Shopify, or a managed iPaaS integration. On the Connect route there is no separate middleware. Uncap Connect keeps Shopify and the ERP in real-time, two-way sync of inventory, orders, customers and pricing. It syncs "customer-specific pricing, credit terms, and tax rules," and the ERP stays the system of record.

Replacement stock by branch. Branch-first availability, showing the buyer's home branch and then the nearest branches with will call, is built during implementation on inventory synced through Uncap Connect. A replacement offered as a package, with the control and tank on site checked against the new pump, is built from the same package rules.

Accounts that match how the trade buys. In Uncap Portal, plumbing contractors, well drillers, HVAC contractors and facility buyers get real multi-user accounts with roles and permissions. Each buyer sees their assortment and pricing. Pressure switches, float switches and check valves sit on reorder lists. Budgets, approvals and limits per user let a facility manager cap what a technician can order, and NET terms, invoices and payments sit in the portal. For a manufacturer selling through distributors, reps see activity and openings at a glance.

Engineered selections through Uncap Quotes. Uncap Quotes runs the configure, price, quote process inside the Shopify admin, with negotiated prices, tiers and volume breaks applied automatically. It sends exceptions to the right approver. Quotes carry validity windows and a full revision history, and approved quotes turn straight into Shopify orders. The duty point, the selected model and the package go on the quote, in fields configured during implementation.

Duty point selection. Flow and head entered once and matched against manufacturer curve data, built during implementation.

Off-curve quotes. A duty point no stock model meets goes to Uncap Quotes, with the routing rules configured during implementation.

Pump and control packages. Pump, control box, switch, tank or drive sold as one record with its own price and rating fields, built during implementation.

Tank and switch pairing. Each well package carries the precharge note for its switch setting, built during implementation.

DOE scope and rating fields. Scope flag, rated PEI and bare pump model number per SKU from manufacturer data, shown on product and catalog pages, configured during implementation.

Branch-first replacement stock. Home branch, nearest branches and will call, built during implementation on inventory synced through Uncap Connect.

Contractor and facility accounts. Roles and permissions, assortment and pricing per buyer, reorder lists and per-user limits in Uncap Portal.

ERP sync, Connect or managed iPaaS. Pricing, inventory, customers and orders kept current between Shopify and the ERP, through an owned Uncap Connect app embedded in Shopify, or a managed iPaaS integration.

The line between product and build, in writing. Account pricing, approval routing, validity windows, one-click order conversion, reorder lists and per-user limits ship in Uncap Quotes and Uncap Portal. Duty-point selection, pump packages, DOE rating fields and branch-first availability are built during implementation from your data. The scope says which is which.

Credentials you can check. Uncap is a Shopify Platinum Partner, on Shopify since 2013, with 380+ unified storefronts launched on Shopify.

Scoped before it is built. The Uncap Blueprint is a fixed-price, four-week Shopify migration plan, credited 1:1 toward implementation. It covers solution architecture, a data migration taxonomy, an ERP integration audit, UX and flow prototyping, total cost of ownership and a risk register, and ends with a fixed-cost implementation estimate. For a pump manufacturer or distributor, that architecture work can cover curve data, package rules, DOE rating fields and the ERP integration. You walk with everything you need to brief any agency or your in-house team.

This page sits under plumbing, HVAC and mechanical supply ecommerce, which covers model and serial lookup, supersession and fittings. This page goes one level down, into selecting a pump by duty point and selling it with its control. Boilers and water heaters have their own page on water heater and boiler ecommerce. Irrigation and water systems covers pumps sold for farm and landscape irrigation, where pump sizing goes to a designer, while this page covers pumps for buildings, wells, drainage and hydronic systems. For how irrigation distributors quote pumps beside configured kits, see the field notes on irrigation kits and pump quoting. For the ERP side, see the Epicor Prophet 21 integration, the Epicor Eclipse integration, or the full list of ERP integrations.

Bring two documents. The first is the curve sheet for your best-selling booster or well pump line, with the duty points your counter quoted against it last month. The second is the list of controls and tanks your counter puts with each of those pumps. Together they show how much selling still happens off the product page.

Book a strategy session with Uncap, or start with a Blueprint if what you need first is the curve data, package rules and DOE fields written down and costed.