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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.

Exact-size advertised price, dimensions, minimum room air, noise, and performance for each offered size
Size and model	Lowest current 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.	Unavailable at this retailer plumbEstore View retailer source for GS5-45HPC HP + ECO-43SSAQB (opens in a new tab) The exact package listing displayed $5,845 but was Backordered and unavailable for immediate shipment; it will ship when back in stock. Add to Cart remained visible, but this observation is excluded from current price claims. Excluded from every lowest-price claim. A current amount appears only after we verify and publish a new eligible seller observation.	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.	Unavailable at this retailer plumbEstore View retailer source for GS5-45HPC HP + ECO-83SSAQB (opens in a new tab) The exact package listing displayed $6,228 but was Backordered and unavailable for immediate shipment; it will ship when back in stock. Add to Cart remained visible, but this observation is excluded from current price claims. Excluded from every lowest-price claim. A current amount appears only after we verify and publish a new eligible seller observation.	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.	Price withheld pending our next source check plumbEstore View retailer source for SAN-119GLBK tank + GS5-45HPC (opens in a new tab) Exact-model mismatch identified September 6, 2026 at 02:18:59 UTC: the retailer now names GS5-45HPC-D + SAN-119GLBK, not the retained GS5-45HPC system. The earlier $6,983 observation is audit evidence only; official equivalence has not been established. This is not a sold-out finding. No price clock was renewed. The retailer now describes a different model or package. This listing is excluded from current prices until the exact model is resolved; this is not a sold-out claim.	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

The outdoor heat pump and separate storage tank need interconnecting water piping plus weather and freeze planning. No field refrigerant piping is required, but the separate outdoor unit adds installation work compared with an integrated tank.
Budget for the matched heat-pump and tank assembly plus interconnecting piping and outdoor-unit installation. A tank-only listing, unavailable offer or different-capacity package does not establish this system’s current equipment cost.

SANCO2 research spans capacities, generations and complete-system installation choices. None of these threads establishes ownership of the exact current GS5 + ECO-83SSA combination used by this guide.

Why shoppers consider a split system

Discussion focuses on moving the compressor outside, avoiding indoor noise and fitting the tank into difficult spaces. Piping, vibration and freeze-related planning are recurring installation questions, not verified fit approvals.

Based on discussion 1: All-in on SanCO2 Heat Pump Water Heater · discussion 2: Split HPWH – Competitors to SANCO2

There is older long-term context

An 83-gallon owner reports satisfactory operation since a late-2016 installation, apart from rodents damaging insulation. This older-generation anecdote is useful history, not evidence of current GS5 reliability.

Based on discussion 1: All-in on SanCO2 Heat Pump Water Heater

Separate system cost from a tank price

The historical quote thread weighs installation complexity and alternatives. Its amounts describe a particular old project, not today's exact-system equipment price.

Based on discussion 3: Sanden SanCO2 Quote

Explore the discussions

Read our summaries here. Each original thread opens on Reddit only if you choose to follow its link.

r/heatpumps · Mixed-generation owner discussion

All-in on SanCO2 Heat Pump Water Heater on Reddit (opens in a new tab)

A buyer's 43-gallon attic plan is not an operating review. An older 83-gallon owner reports adequate hot water and satisfactory operation since late 2016, apart from rodent-damaged insulation. A different owner says moving a vibrating wall-mounted heat pump to a pad made it inaudible indoors. Exact current GS5 packages and matched sound measurements are not established.

Which model does this cover? SANCO2 systems across 43- and 83-gallon sizes and multiple generations; the current GS5 heat-pump and ECO tank SKU combinations are not established.

r/heatpumps · Comparison and installer anecdotes

Split HPWH – Competitors to SANCO2 on Reddit (opens in a new tab)

Prospective buyers compare SANCO2 with other split-system approaches. Discussion weighs equipment cost, installation complexity, available space, noise, and freeze protection. Some installer experience appears, but neither the current heat-pump SKU nor tank configuration is established.

Which model does this cover? SANCO2 family comparison without exact GS5 or ECO tank model identification.

r/heatpumps · Historical installation quote

Sanden SanCO2 Quote on Reddit (opens in a new tab)

A Houston homeowner seeks opinions on a 43-gallon system quote and installation charges. Replies discuss contractor pricing, piping work, and alternative systems. Treat all quoted amounts as historical anecdotes, not current equipment or installation prices.

Which model does this cover? Historical 43-gallon SANCO2 quote and wider installation discussion; exact current heat-pump and tank SKUs are not identified.

How we read and use these discussions

These are our original summaries of publicly retrieved posts and comments, not a live Reddit feed or a verified-purchase review collection. The displayed date records our research read; a retrieved copy may lag the live thread. We do not claim to include every comment or verify owner identities. Questions, commercial participation, different capacities and generations stay labeled.

We do not turn thread participants into review totals, combine them with retailer ratings, infer failure rates, or use their quoted prices as current offers. Dated reading notes remain available as research; ratings and other time-sensitive source observations have separate expiry rules. Editorial re-reading is due seven days after the recorded read, without automatically changing that date.

Equipment prices, not installed quotes

Where to buy and what it costs

We check Home Depot, Lowe’s, Menards and SupplyHouse.com first. Prices exclude installation, permits, accessories, tax, shipping and rebates unless explicitly stated.

No eligible current seller price is available. A new source check is required before an amount can appear; expired prices are withheld.

Direct, non-affiliate links. Family-variant and list prices are labeled; neither means the pictured exact model is in local stock.

Validate the product evidence

Official specifications and documents

Use these primary manufacturer documents to verify the comparison facts for the exact model.