Envirosun Hot Water Systems from $2,179
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Envirosun Hot Water Systems
Compare Envirosun heat pumps, solar hot water and gas continuous-flow systems, plus related Enviroheat models, by size, technology and current supply-only price.
Envirosun is an Australian-owned hot-water brand with roots in the Australian solar industry and is now part of Energie Group Australia. The current Envirosun range covers HP Plus M9 and HP Classic heat pumps, roof-mounted and split solar hot water, and Endless gas continuous flow. The brand’s product development is Australian-led, with components and manufacturing sourced across Australia and overseas depending on the product.
Use this page as the main Envirosun topical hub. Compare the M9 200 and 330, understand the older/classic 250L heat-pump platform and Enviroheat relationship, compare solar thermosiphon with active split systems, learn how the Endless gas range differs from stored hot water, check sizing and installation considerations, and compare current HWO pricing before ordering.
Envirosun Hot Water Range Explained
Envirosun’s current range is built around three main technologies: heat pump, solar and gas continuous flow. Heat pumps and solar use renewable heat sources to reduce purchased energy, while the Endless gas family provides compact on-demand hot water without a storage tank.
190L and 330L inverter heat pumps using R290 refrigerant and quiet 42dB(A) operation.
Established 246L platform using R134a refrigerant and a 1.5kW electric backup element.
167L and 304L thermosiphon solar systems with electric or gas boosting.
320L and 420L ground tanks with roof collectors and pumped circulation.
20L/min and 26L/min Natural Gas or LPG continuous-flow systems.
Envirosun M9 200L & 330L Heat Pumps
The HP Plus M9 is Envirosun’s newer inverter heat-pump platform. The ES200M9 has 190L total water capacity while the ES330M9 has 330L. Both use R290 refrigerant, a 1.5kW electric backup element, inverter heat-pump technology and a 42dB(A) sound-pressure rating.
Envirosun lists an ambient operating range from -7°C to 45°C for the M9. The 200 model is broadly positioned for 2–4 people and the 330 for 4–6 people, but actual household suitability depends on shower duration, baths, recovery timing and how heavily hot water is used back-to-back.
M9 200 / ES200M9
190L total capacity, 3.2kW average heat-pump heating capacity at stated test conditions, R290 refrigerant and a compact 580 × 620mm footprint. It is the smaller M9 for lower to medium household demand.
M9 330 / ES330M9
330L total capacity with approximately 3.3kW average heat-pump heating capacity at stated conditions. The larger tank provides more stored reserve for higher-demand homes.
R290 & Inverter Technology
R290 is a low-GWP refrigerant. The inverter compressor can vary output instead of operating only at one fixed speed, helping the system balance recovery, efficiency and noise.
Noise & Siting
Envirosun rates both M9 models at 42dB(A). Even a quiet heat pump still needs sensible placement away from bedrooms and noise-sensitive boundaries, with adequate airflow and service clearances.
HP Classic 250 & Enviroheat Heat Pumps
The Envirosun HP Classic 250 is the established 246L-class heat-pump platform. It uses R134a refrigerant, an approximately 1.5kW electric backup element and a 46dB(A) sound-pressure rating. The platform has been used across the wider Energie Group hot-water family and is distinct from the newer R290 M9 series.
Enviroheat is a separate Energie Group brand introduced for heat-pump hot water. HWO may list Enviroheat models alongside Envirosun because of the shared group and product lineage. Do not assume the Envirosun and Enviroheat names make every model identical: use the full model code and current specification when comparing capacity, refrigerant, controls and warranty.
M9 uses the newer R290 inverter platform and is available in 190L and 330L capacities. Classic 250 uses the proven 246L R134a platform. The decision should consider household demand, physical size, noise, refrigerant, controls, current warranty and purchase price.
How an Envirosun Heat Pump Heats Water
A heat pump works like a refrigerator in reverse. A fan moves ambient air across an evaporator, refrigerant absorbs that heat, the compressor raises the refrigerant temperature and the condenser transfers the heat into the stored water. Because the system moves heat rather than creating all of it with a resistive element, electricity use can be substantially lower than conventional electric storage under suitable conditions.
Electric Backup Element
Current M9 and Classic models include a 1.5kW element. Depending on operating mode and conditions, it can assist with fast recovery, high-temperature cycles or low-ambient operation.
Solar PV Timing
Heat pumps can be scheduled to operate during daylight hours so rooftop solar PV generation is used when available. The best timer strategy depends on household use, tariff and the product controls.
Condensate
Heat pumps remove moisture from the air as they operate, so condensate needs a suitable drain path. This is normal operation and should be planned during installation.
Airflow
The heat-pump section needs free airflow. Enclosing the unit tightly or restricting air movement can reduce performance and create service-access problems.
Envirosun TS, THX & AS Solar Hot Water
Envirosun’s solar range has two main layouts. TS and THX are roof-mounted thermosiphon systems where the storage tank and collectors sit together on the roof. AS Active Split separates the tank and collectors, leaving the collectors on the roof and placing the larger storage cylinder at ground level.
TS Thermosiphon
Available around 167L and 304L. Natural thermosiphon circulation moves heated water without a solar circulation pump. Current systems use stainless-steel tanks and can be electrically or gas boosted.
THX Freeze-Protected Solar
The closed-circuit THX configuration is intended for areas needing additional freeze protection. It still uses roof-mounted tank-and-collector construction but separates the potable water from the collector heat-transfer circuit.
AS Active Split
Available around 320L and 420L, with ground-mounted storage and roof collectors. A controlled circulation pump moves solar-heated fluid or water between collectors and tank depending on system configuration.
Electric vs Gas Boost
Solar still needs backup for periods of low solar gain or unusually high demand. Envirosun offers electric-boosted and gas-boosted configurations across parts of the solar range.
Envirosun Continuous-Flow Gas Hot Water
The CF Endless Series is Envirosun’s gas continuous-flow range. Current products are available in 20L/min and 26L/min Natural Gas and LPG versions with a 6.2-star gas energy rating. Unlike a storage system, Endless heats water as it flows through the appliance.
| Model class | Flow | Typical comparison | Key checks |
|---|---|---|---|
| Endless 20 | 20L/min | Lower to medium simultaneous hot-water demand. | Natural Gas/LPG, gas supply, water pressure, temperature setting and power. |
| Endless 26 | 26L/min | Higher simultaneous demand and larger households. | Gas type, gas pipe capacity, water flow, power and likely simultaneous outlets. |
The range uses direct ignition, WaterServo temperature/flow control and FlameSustain technology. Envirosun lists 11 temperature set points from 38°C to 75°C, with 50°C factory presets on relevant models. LPG versions are specified for propane and must match the fuel supply.
What Size Envirosun Hot Water System Do I Need?
For stored hot water, size from actual daily demand rather than household size alone. A useful guide is around 40L per person per day for light use, 50L average, 65L high use and 80L very heavy use. Heat-pump recovery and operating schedule then determine how much stored reserve is required.
The 200 gives a compact 190L total capacity and suits lower-demand homes. The 330 gives substantially more stored water and is the better starting point where several people shower close together, bath use is common or the home needs a larger overnight reserve.
How the Main Envirosun Options Compare
| Envirosun type | Heating method | How to size | Main site checks | Common reason to choose it |
|---|---|---|---|---|
| M9 Heat Pump | R290 inverter heat pump + element. | 190L or 330L + recovery. | Airflow, noise, condensate, power and footprint. | Efficient electric hot water with modern low-GWP refrigerant. |
| Classic 250 Heat Pump | R134a heat pump + element. | 246L + recovery. | Airflow, power, condensate and available height. | Proven mid-size heat-pump platform. |
| TS / THX Solar | Roof solar collectors + booster. | 167L or 304L + collector area. | Roof load, sun, orientation, freeze zone and booster. | Roof-mounted solar with no separate ground tank. |
| AS Split Solar | Roof collectors + pumped ground tank. | 320L or 420L + collectors. | Roof, pump/controller, tank site and booster. | Large solar capacity with ground-level storage. |
| Endless Gas | Gas continuous flow. | 20 or 26L/min + simultaneous demand. | Gas type, supply capacity, water pressure and power. | On-demand hot water without tank storage. |
Replacing an Existing Hot Water System with Envirosun
The simplest replacement is usually the closest technology match, but Envirosun is often considered when moving from conventional electric storage to heat pump or when replacing older solar hot water. Changing technology can reduce running costs but adds site checks that a straightforward tank swap may not need.
Record tank size, energy source, model, dimensions and current connection requirements.
Consider household size, shower habits, baths and whether the existing unit runs out.
Measure clearances and check airflow, condensate, power, roof or gas requirements.
Compare M9, Classic, solar or continuous flow against the existing setup and future energy goals.
Electric Storage to M9
A common upgrade path. Check power supply, airflow, condensate, noise, footprint and whether 190L or 330L better matches household demand.
Old Heat Pump to M9
Compare actual storage volume, height, width, plumbing connection positions, electrical supply and condensate before assuming a direct replacement.
Old Solar to New Envirosun Solar
Determine whether the existing system is thermosiphon or split, collector count, booster type, roof suitability and tank location before selecting TS, THX or AS.
Gas Storage to Endless
Moving to continuous flow removes stored capacity but changes sizing to L/min and may require changes to gas pipe, power, water flow and installation location.
Envirosun Rebates & STC Eligibility
Eligible Envirosun heat-pump and solar systems can create Small-scale Technology Certificates when installed in accordance with the scheme rules. The number and value of certificates depends on the exact registered model, installation date, geographic zone and current scheme settings. State-based incentives can have additional eligibility rules.
Do not choose a system solely from a headline rebate amount. Compare the post-rebate purchase and installation cost, household demand, expected electricity or gas use, warranty and the suitability of the installation site.
Will an Envirosun Heat Pump Fit My Existing Location?
Check the exact product dimensions and filled weight rather than relying on the marketed litre class. The M9 200 is approximately 580 × 620 × 1746mm and can weigh around 282kg when filled, while the M9 330 is substantially larger at about 710 × 740 × 1923mm and around 449kg filled. The 250 Classic is taller again at around 1987mm.
Heat pumps also need clear airflow, condensate drainage and sensible acoustic placement. Water pressure, PTR/ECV requirements, hot and cold connection positions and access for future service should all be checked before ordering.
Envirosun Hot Water System Prices
Compare current product prices, then open the system to check stock, specifications, delivery and optional parts.
Product price only. Delivery, valves, fittings, pipework, installation and other extras are separate unless expressly included with the selected product.
Envirosun Warranty & Maintenance
Warranty depends on the exact model and purchase date. Envirosun currently promotes a 10-year transferable warranty across its current range subject to the applicable terms, while older Enviroheat heat pumps can use different tank, compressor, parts and labour periods.
Magnesium Anodes
Current M9 and Classic heat-pump specifications use magnesium-anode corrosion protection. Anode condition and water quality can affect cylinder life, so follow the maintenance requirements for the exact model.
Water Quality
Envirosun installation material sets water-quality limits for some product families. High hardness, dissolved solids, chloride or other out-of-range water conditions can affect warranty and service life.
Heat-Pump Components
A heat pump combines the tank, compressor, fan, controls, refrigerant circuit and backup element. A fault in one component does not automatically mean the cylinder itself has failed.
Keep the Model Code
Record ES200M9, ES330M9 or the exact Enviroheat model number. The model code is important for warranty, spare parts, technical support and future replacement matching.
Common Envirosun Heat Pump Problems & Replacement Signs
A heat pump that stops producing hot water does not automatically need complete replacement. Power-supply issues, operating mode, sensors, fan/compressor faults, refrigerant-system faults, electric-element problems or control errors can all affect operation. A leaking cylinder, major corrosion or repeated high-cost failures are stronger replacement indicators.
Not Heating
Check the system is powered and that the selected operating mode and timer are appropriate. Electrical and refrigeration diagnostics should be completed by the appropriate licensed trade.
Long Recovery
Heavy demand, low ambient temperature, operating mode, restricted airflow or a fault can all increase recovery time. Compare actual use against the selected tank size before assuming the unit is undersized.
Excessive Noise
Normal fan and compressor operation creates some sound, but new vibration, rattling or abnormal compressor noise should be investigated.
Water Around the Unit
Condensate can be normal. Water from plumbing connections, relief valves or the cylinder is different and should be identified before deciding whether repair or replacement is required.
Buying an Envirosun Hot Water System Supply Only
Choose the system first, then check delivery and add only the valves, pipework, fittings or accessories required for the job. For a replacement, the old model number, capacity, energy source, dimensions and a clear photo of the existing installation make product matching much easier.
Envirosun Hot Water System Questions
Answers to common Envirosun price, M9, Enviroheat, heat-pump, solar, gas, sizing, replacement, warranty and rebate questions.