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Independent shopper guide · SANCO2

SANCO2 GS5 with 83-gallon tank buying guide

A two-piece outdoor CO2-refrigerant heat-pump system paired here with an 83-gallon storage tank. It differs substantially from integrated indoor HPWHs: the compressor sits outside, the tank is separate, and professional design must account for piping, freeze protection, controls, and site conditions.

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Shopper guide · about 8 minutes.
Editorial synthesis awaiting refresh. Each specification, price, and review source below remains governed by its own displayed source date and may still be current.

Same product line, different fit

Compare size, price, room air and noise

Use first-hour rating—not tank size alone—to compare hot-water delivery. Prices are exact-size public observations before tax, shipping, installation and rebates, and can change at any time. Room-air and sound figures keep their exact source scope and qualifications.

SANCO2 uses a separate outdoor heat-pump unit and indoor tank. The 43- and 83-gallon ratings are exact ENERGY STAR records 3701841 and 3624317; the 119-gallon ratings are from the official SAN-119GLBK submittal and are not used here as an exact catalog binding.

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Exact-size advertised price, dimensions, minimum room air, noise, and performance for each offered size
Size and model	Lowest advertised price	Product dimensions	Minimum room air	Noise level (dBA)	Rated storage	First-hour rating	UEF	Power / circuit	Empty weight
43 galGS5-45HPC HP + ECO-43SSAQBExact U.S. ENERGY STAR record 3701841; compact two-piece system.	No public exact-size listing found No other capacity or sibling model is substituted.	38 1/8 in H × 24 1/2 in diameter	N/A — outdoor heat pump Requirement details The official GS5 manual requires the GS5-45HPC heat-pump unit outdoors; the separate storage tank may be indoors or outdoors. Therefore an integrated-HPWH indoor room-volume minimum does not apply to these systems. Outdoor airflow clearances, an outdoor location, and the manual's maximum tank-to-heat-pump distance still apply. Installation source for GS5-45HPC HP + ECO-43SSAQB (opens in a new tab).	37 dBA outdoor unit Sound evidence outdoor GS5-45HPC sound level, not indoor tank/whole-system sound This is the outdoor heat-pump component value, not a tank-generated or whole-system indoor acoustic measurement. Sound source for GS5-45HPC HP + ECO-43SSAQB (opens in a new tab). Second source for GS5-45HPC HP + ECO-43SSAQB (opens in a new tab).	43 gal	73 gal	3.7	230V	88 lb
83 galGS5-45HPC HP + ECO-83SSAQBExact U.S. ENERGY STAR record 3624317 and the representative system reviewed here.	No public exact-size listing found No other capacity or sibling model is substituted.	68 7/8 in H × 24 1/2 in diameter	N/A — outdoor heat pump Requirement details The official GS5 manual requires the GS5-45HPC heat-pump unit outdoors; the separate storage tank may be indoors or outdoors. Therefore an integrated-HPWH indoor room-volume minimum does not apply to these systems. Outdoor airflow clearances, an outdoor location, and the manual's maximum tank-to-heat-pump distance still apply. Installation source for GS5-45HPC HP + ECO-83SSAQB (opens in a new tab).	37 dBA outdoor unit Sound evidence outdoor GS5-45HPC sound level, not indoor tank/whole-system sound This is the outdoor heat-pump component value, not a tank-generated or whole-system indoor acoustic measurement. Sound source for GS5-45HPC HP + ECO-83SSAQB (opens in a new tab). Second source for GS5-45HPC HP + ECO-83SSAQB (opens in a new tab).	83 gal	121 gal	3.8	230V	115 lb
119 galSAN-119GLBK tank + GS5-45HPCOfficial SAN-119GLBK submittal rating; exact ENERGY STAR catalog comparison is not asserted here.	No public exact-size listing found No other capacity or sibling model is substituted.	63 3/5 in H × 28 in diameter	N/A — outdoor heat pump Requirement details The official GS5 manual requires the GS5-45HPC heat-pump unit outdoors; the separate storage tank may be indoors or outdoors. Therefore an integrated-HPWH indoor room-volume minimum does not apply to these systems. Outdoor airflow clearances, an outdoor location, and the manual's maximum tank-to-heat-pump distance still apply. Installation source for SAN-119GLBK tank + GS5-45HPC (opens in a new tab).	37 dBA outdoor unit Sound evidence outdoor GS5-45HPC sound level, not indoor tank/whole-system sound This is the outdoor heat-pump component value, not a tank-generated or whole-system indoor acoustic measurement. Sound source for SAN-119GLBK tank + GS5-45HPC (opens in a new tab). Second source for SAN-119GLBK tank + GS5-45HPC (opens in a new tab).	119 gal	134 gal	3.72	208/230V GS5 heat-pump unit	345 lb

Check the official size specification from SANCO2 official technical document library (opens in a new tab). Final dimensions and requirements must be confirmed against the exact model ordered.

Ownership essentials

Warranty and connected controls

Confirm coverage terms and supported controls for the exact model before purchase.

Warranty: Manufacturer technical documents state 3 years labor, 10 years heat-pump parts, and 15 years for the 43- and 83-gallon tanks; the current written residential warranty controls all eligibility and exclusions.Official warranty terms for SANCO2 GS5-45HPC HP + ECO-83SSAQB (opens in a new tab)
Smart-home control: The reviewed exact ENERGY STAR configuration is listed as not connected-capable. System controls and optional demand-response hardware should not be represented as a consumer smart-home app.Official controls source for SANCO2 GS5-45HPC HP + ECO-83SSAQB (opens in a new tab)

Pros

The outdoor split architecture supports cold-climate operation down to a manufacturer-listed -25°F and keeps compressor sound outdoors.
The exact 83-gallon system has a 121-gallon ENERGY STAR first-hour rating and uses R744 CO2 refrigerant.

Cons

This is a two-piece outdoor-compressor system, so it needs refrigerant-water piping, weather and freeze planning, and more design work than an integrated indoor tank.
Its observed equipment prices are several thousand dollars above mainstream integrated 50- to 80-gallon alternatives before installation, piping, shipping, or permits.

Reviews you can read here

What reviewers and owners report

Each card gives you our source-specific summary on this page. Ratings and counts stay separate, and related-model or professional evidence is clearly labeled.

Coverage at a glance

An exact 83-gallon seller sample, a professional field review, and a long owner discussion provide three different perspectives. They remain separate because configurations and installation contexts vary.

Sources were checked independently on 2026-09-02. Onsite text is an original concise paraphrase, not a copied review body. Ratings and counts remain source-specific; related models and professional evaluations are explicitly labeled.

Owners praise

Very quiet outdoor operation and low electricity use recur
Owners value large-volume hot water and flexible storage

Owners flag

Upfront equipment cost is much higher than integrated alternatives
Specialized piping, freeze protection, and service availability need planning

plumbEstore — 83 gallon system

GS5-45HPC HP + ECO-83SSAQB

2 entries

Current count only

The small exact-system sample includes satisfaction with the system and seller support. Two entries are far too few for recurring reliability or performance conclusions.

Exact model: The exact-system seller page exposes two entries but no stable aggregate used here. Seller-service comments and product-performance comments are kept in their limited context.

Green Building Advisor field review

SANCO2 GS-series family

1 evaluation

Independent professional evaluation

The field review highlights very quiet outdoor operation, efficient CO2-refrigerant performance, and flexible storage, while emphasizing higher upfront cost and greater piping and design complexity than an integrated unit.

Related listing with explicit scope: The field article covers SANCO2 split-system design and includes installer or owner experience. It is not a retailer aggregate and spans configurations.

SANCO2 GS-series family on Reddit (opens in a new tab)

Reddit owner discussion · r/heatpumps

8 owner reports

Identifiable owner reports

Discussion summary: Owners praise low electricity use, outdoor quietness, and large-volume hot water. Concerns focus on purchase cost, specialized installation, freeze or outage planning, and service familiarity.

Related listing with explicit scope: The long community discussion includes SANCO2 owners and prospective buyers across tank sizes. Reports are self-selected and installation-specific.

The summaries above are readable here; the verification links are optional. We paraphrase rather than republish copyrighted review bodies. Coverage is broad but cannot be literally exhaustive, and a small, incentivized, seller-hosted, family-level, professional, or community sample is not a reliability study.

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Buying guide details