Daikin SmartSource® Plus – Supplied & Professionally Installed by 4Most Energy
The flagship of Daikin's SmartSource® 3-Tier lineup, the Premium horizontal water source heat pump is the top-tier ceiling-suspended replacement for the aging unit hidden above your ceiling tiles today — most commonly Carrier, Keeprite, Lennox, McQuay, or an older Daikin — built for sound-sensitive spaces and buildings pursuing LEED or high-efficiency targets. Available in single-stage (WSSH) or two-stage (WSTH) compressor configurations from 7,000 to 70,000 Btuh, it pairs EC fan motors standard on every unit with the highest efficiency ratings in the small-capacity SmartSource line, common in offices, retail, hotels, and condominium-style commercial and residential buildings. 4Most Energy supplies and installs new units and also repairs and services your existing one, matching your existing duct and water loop connections for a clean job either way.
Unit Specifications Comparison
| Specification | WSSH | WSTH |
|---|---|---|
| Compressor | Single-stage | Two-stage |
| Nominal Capacity Range | ½–6 ton (7,000–70,000 Btuh) | 2–6 ton (24,000–70,000 Btuh) |
| Sizes | 007–070 | 024–070 |
| Voltage Options | 115/60/1, 208-230/60/1, 208-230/60/3, 265/60/1, 460/60/3, 575/60/3 | 208-230/60/1, 208-230/60/3, 460/60/3, 575/60/3 |
| Approx. Unit Weight | 123–296 lbs | 198–296 lbs |
Warranty
Daikin Applied backs every SmartSource Premium unit with a standard 12-month parts warranty from start-up (or 18 months from ship date, whichever occurs first). Extended coverage — up to 4 years on the compressor, refrigerant circuit, or complete unit, with optional first-year or 5-year labor allowances — is available at the time of purchase. 4Most Energy handles warranty registration and the required Check, Test & Start documentation on your behalf.
| Model | Depth | Width | Height | EER | COP | Description |
|---|---|---|---|---|---|---|
| WSSH007 | 19.00" | 42.00" | 17.00" | 18.7 | 6.0 | 7,000 Btuh single-stage horizontal water source heat pump designed for efficient ceiling-suspended applications. |
| WSSH009 | 19.00" | 42.00" | 17.00" | 18.0 | 5.6 | 9,000 Btuh single-stage horizontal water source heat pump designed for efficient ceiling-suspended applications. |
| WSSH012 | 19.00" | 42.00" | 17.00" | 16.9 | 5.5 | 12,000 Btuh single-stage horizontal water source heat pump designed for efficient ceiling-suspended applications. |
| WSSH015 | 21.50" | 49.00" | 19.00" | 19.9 | 5.8 | 15,000 Btuh single-stage horizontal water source heat pump designed for efficient ceiling-suspended applications. |
| WSSH019 | 21.50" | 49.00" | 19.00" | 18.0 | 5.3 | 19,000 Btuh single-stage horizontal water source heat pump designed for efficient ceiling-suspended applications. |
| WSSH024 | 24.00" | 54.00" | 19.00" | 18.1 | 5.8 | 24,000 Btuh single-stage horizontal water source heat pump designed for efficient ceiling-suspended applications. |
| WSSH030 | 24.00" | 54.00" | 19.00" | 19.3 | 6.0 | 30,000 Btuh single-stage horizontal water source heat pump designed for efficient ceiling-suspended applications. |
| WSSH036 | 24.00" | 65.00" | 21.00" | 19.3 | 5.2 | 36,000 Btuh single-stage horizontal water source heat pump designed for efficient ceiling-suspended applications. |
| WSSH042 | 24.00" | 65.00" | 21.00" | 18.4 | 5.4 | 42,000 Btuh single-stage horizontal water source heat pump designed for efficient ceiling-suspended applications. |
| WSSH048 | 24.00" | 79.00" | 21.00" | 17.5 | 5.0 | 48,000 Btuh single-stage horizontal water source heat pump designed for efficient ceiling-suspended applications. |
| WSSH060 | 24.00" | 79.00" | 21.00" | 17.4 | 5.7 | 60,000 Btuh single-stage horizontal water source heat pump designed for efficient ceiling-suspended applications. |
| WSSH070 | 24.00" | 79.00" | 21.00" | 17.3 | 4.8 | 70,000 Btuh single-stage horizontal water source heat pump designed for efficient ceiling-suspended applications. |
Why Install the SmartSource Premium with 4Most Energy?
- R-32 low-GWP refrigerant — a GWP of 675 versus 2,088 for R-410A, with up to 40% less refrigerant charge required in comparable applications.
- EC fan motors standard on every unit size — the quietest, most efficient motor option in the SmartSource lineup, with no PSC-motor tradeoff.
- Up to 22.0 EER and 6.0 COP — efficiency ratings that exceed ASHRAE 90.1 baseline requirements and support LEED® point targets.
- Single- or two-stage compressor — WSTH two-stage models precisely match part-load demand, reducing cycling and improving comfort versus single-stage-only competitors.
- Brazed-plate or cupronickel heat exchanger for superior corrosion resistance on demanding water loops.
- Full sound blanket and IAQ closed-cell foam insulation packages (sizes 024–070) for the quietest operation in the lineup.
- Optional hot gas reheat dehumidification (sizes 015–070) and auto flow control piping packages (1.5–15.0 GPM) for precision water-side balancing.
- Six designer cabinet color finishes for units with an exposed panel, plus MicroTech® unit controller with optional BACnet® communication.
| Parameter | Value |
|---|---|
| Refrigerant | R-32 (A2L, low-GWP) |
| Heat exchanger | Brazed plate or cupronickel (enhanced corrosion resistance) |
| Fan motor | EC (electronically commutated) standard on all sizes |
| Efficiency | Up to 22.0 EER / 6.0 COP |
| Dehumidification | Simplified dehumidification standard; hot gas reheat optional (sizes 015–070) |
| Minimum / Nominal / Maximum water flow | 1.5 / 3.0 / 4.0 GPM per ton (auto flow control packages 1.5–15.0 GPM available) |
| Standard entering water temp range | 55°F–120°F cooling; 55°F–90°F heating |
| Extended entering water temp range | 30°F–120°F cooling; 25°F–90°F heating |
| Controller | MicroTech® (BACnet® optional) |
| Filtration | 1" disposable, 2" MERV 8, or 4" MERV 13 |
| Cabinet finish | Galvanized standard; 6 designer color finishes available |
| Certifications | AHRI Certified (ISO 13256-1), ETL/Intertek Listed, BACnet International member |
Technical note: Efficiency figure (up to 22.0 EER / 6.0 COP) is sourced from Daikin Applied's product overview; confirm exact by-size EER/COP against Engineering Data ED 19137-3 before publishing final specs.
Sizing Guide
SmartSource Premium units are sized by nominal cooling capacity (sizes 007 through 070, corresponding to ½ through 6 tons). Correct sizing depends on the served zone's square footage, glazing/exposure, occupancy, and the existing ductwork's airflow capacity — not simply matching the nameplate of the unit being removed, since older Carrier, Keeprite, Lennox, and McQuay units were sometimes oversized by the standards of their era. Because the Premium tier carries a cost premium over Compact and Plus, it's best matched to spaces where its specific advantages (acoustic performance, efficiency, LEED point contribution) have measurable value — hotel guest rooms, boardrooms, and buildings tracking energy-efficiency incentive programs.
4Most Energy performs a load calculation and ductwork/water flow verification as part of every quote to confirm the correct size and configuration before ordering.
- Site assessment — existing unit inspection (brand, model, condition), water loop and electrical evaluation, ductwork condition check, and acoustic requirements review.
- Load calculation and unit sizing — confirm correct WSSH/WSTH size and configuration (cabinet hand, discharge orientation, sound package, cabinet finish if exposed).
- Ceiling access and lift setup — open the ceiling tile or cut a drywall access panel above the unit and position a lift to safely reach and support the equipment.
- Isolation and disconnection — lockout/tagout of electrical and water loop; safe removal of the old unit (refrigerant recovery if applicable).
- Suspension and mounting — new hanger rods, brackets, and vibration isolators installed to structural requirements.
- Water piping and ductwork connections — braided stainless supply/return hoses, auto flow control piping package, condensate drain with trap, and duct collar tie-in with acoustic lining.
- Electrical connection — ESA-compliant hookup to the building's dedicated circuit and disconnect.
- Commissioning — Check, Test & Start per Daikin Applied protocol, including flow rate, temperature differential, dehumidification setpoint (if equipped), and refrigerant circuit verification, with warranty registration on file.
- Ceiling close-up, patch, and paint — the access opening is closed, drywall patched, and painted to match the surrounding ceiling before the crew leaves site.
Standard warranty: 12 months parts from start-up or 18 months from ship date, whichever occurs first. Extended warranty options (1-year or 4-year, on compressor only, refrigerant circuit, or complete unit, with optional labor allowances) are available at purchase — 4Most Energy will review the right level of coverage for your building's usage profile, particularly recommended given the higher component cost of the Premium tier's EC motors and brazed-plate heat exchanger.
Ongoing maintenance is minimal: EC motors are permanently lubricated and require no oiling. Filters should be checked every 60 days initially and adjusted to your building's actual lint/dust load thereafter; the condensate drain pan should be inspected and flushed annually; and auto flow control piping components and strainers should be inspected regularly. 4Most Energy offers scheduled maintenance plans that cover filter changes, condensate pan cleaning, refrigerant circuit checks, and annual performance logging to keep the unit operating at its rated efficiency.
Service Area
Greater Toronto Area (GTA) and surrounding regions
Toronto, Markham, Richmond Hill, Vaughan, Aurora, Newmarket, Scarborough, Brampton, and Mississauga.
Extended Service Area: Stouffville, Oshawa, Barrie, Orangeville, Hamilton, St. Catharines, Guelph, Kitchener.
Frequently Asked Questions
How do I know if I even have this type of unit?
Look for a removable ceiling tile or small access panel with no visible equipment in the room — just a grille or duct register. If a technician has ever opened that panel to change a filter, that's this unit. It's the standard equipment type in offices, retail spaces, hotels, and condominium-style commercial buildings, and it's also common behind the ceiling in individual condo suites. Send us a photo if you're not sure.
Is the SmartSource Premium a direct replacement for my existing Carrier, Keeprite, Lennox, McQuay, or Daikin unit?
In most cases, yes — the horizontal ceiling-suspended footprint, duct collar locations, and water connections are compatible with standard retrofit practice, though 4Most Energy always verifies exact dimensions and cabinet hand/discharge configuration before ordering.
Can 4Most Energy just repair my existing unit instead of replacing it?
Yes. We service and repair existing water source heat pumps of any brand, not only Daikin. If your unit is fixable and doesn't need full replacement, we'll tell you that upfront rather than push a new install.
Will you need to cut open my ceiling to do the work?
Yes, for a replacement or new install — the unit sits above the ceiling, so we open a tile or cut a drywall access panel, bring in a lift to safely support the equipment, and close, patch, and paint the opening to match your ceiling before we leave. Repairs on an existing unit sometimes only need the existing access panel opened, with no patching required.
Is the Premium tier worth the price difference over Compact or Plus?
It depends on the space. If noise sensitivity, energy-efficiency incentives, or LEED point targets are a priority, the standard EC motors, higher EER/COP, and full sound blanket packages justify the premium. For straightforward comfort replacements without those priorities, the Compact or Plus tier may be the better value.
What's the difference between the single-stage WSSH and two-stage WSTH?
The WSTH's two-stage compressor better matches part-load conditions, reducing cycling and improving comfort and efficiency versus the single-stage WSSH, at a modest cost premium.
Can this unit contribute to LEED certification points?
Its efficiency ratings (up to 22.0 EER / 6.0 COP) exceed ASHRAE 90.1 baseline requirements, which can support energy-performance-related LEED credits — 4Most Energy can provide documentation to support your project's submission, though credit eligibility depends on the overall building system design.
How long does a typical unit replacement take?
Most single-unit horizontal WSHP replacements in occupied condo, office, or hotel space, including ceiling patch and paint, are completed in a single day, minimizing disruption to occupants.
Horizontal Heat Pump
