BTO Storage Water Heaters: A Guide to the Top 4 Models

BTO Storage Water Heaters: A Guide to the Top 4 Models
Introduction: BTO Storage Water Heaters
When outfitting a new Build-To-Order (BTO) flat in Singapore, selecting the right storage water heater is crucial to ensuring a continuous supply of hot water.
Given the limited space typical of BTO flats, choosing a model that balances size, capacity, and efficiency is key.
Here, we explore the top four storage water heater models ideal for BTO residences, each offering unique features suited to different family sizes and needs.
1. Ariston SL2 20 RS
The Ariston SL2 20 RS is renowned for its sleek, slim profile, making it perfect for installation in the confined spaces often found in BTO units. With a 20-litre capacity, this heater is ideally suited for a small family of up to three people. Its compact design does not sacrifice performance, ensuring that even the smallest BTO bathroom can accommodate this efficient unit.
Ariston SL2 20 RS Technical Specifications:
Model Code | 3180694 |
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Capacity | 20 Litres |
Power | 2.5 kW |
Voltage | 230 V |
Heating Time (ΔT=35°C) | 20 minutes |
Max Working Temperature | 70 °C |
Max Working Pressure | 7.5 bar |
Heating Element Material | Copper |
IP Protection | IPX1 |
Net Weight | 12 kg |
Dimensions (W x H x D) | 704 x 282 x 301 mm |
Warranty | 5 years on tank, 1 year on heating element |
Safety Mark Number | 191150-11 |
These specifications indicate that the Ariston SL2 20 RS is well-suited for small to medium-sized BTO flats, offering quick heating times and a compact design that can fit easily into limited spaces. The use of a copper heating element and a robust warranty also suggest reliability and durability. This model combines efficient performance with space-saving features, making it an excellent choice for those needing a practical hot water solution in a compact urban living environment.
2. Ariston Andris2 15 RS
For couples or individuals living in a BTO, the Ariston Andris2 15 RS offers an excellent solution with its small profile and 15-litre capacity, perfect for daily needs without occupying too much space.
Ariston Andris2 15 RS Technical Specifications:
Model Code | 3180575 |
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Capacity | 15 Litres |
Power | 1.5 kW |
Voltage | 230 V |
Heating Time (ΔT=35°C) | 26 minutes |
Max Working Temperature | 70 °C |
Max Working Pressure | 7.5 bar |
Temperature Regulation | Knob |
Heating Element Material | Copper |
IP Protection | IPX1 |
Net Weight | 8 kg |
Dimensions (W x H x D) | 360 x 360 x 324 mm |
Warranty | 5 years on tank, 1 year on heating element |
Safety Mark Number | 190037-11 |
This model is designed to fit into the smallest spaces while providing sufficient hot water for a household of one or two individuals. Its quick heating time, combined with a temperature control knob, allows for easy management of water temperature. This model’s durability is ensured by the use of a copper heating element and substantial warranty terms. Ideal for those living in BTO flats where space is at a premium and efficiency is valued.
3. Rheem EHG25S
The Rheem EHG25S is designed for slightly larger families of up to four people, featuring a “slim” profile that offers a bit more capacity without compromising on space efficiency.

Rheem EHG25S Technical Specifications:
Model | EHG-25S |
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Capacity | 25 Litres |
Dimensions | Length: 645 mm Diameter: 340 mm Width from wall: 230 mm Total width (with control panel): 360 mm |
Heating Time | Approx. 22 minutes to reach 60°C (from 25°C) |
Preset Temperature | 60°C |
Heating Element Input | 3 kW, 230V |
Empty Tank Weight | 16.7 kg |
Operating Tank Weight | 41.7 kg |
Mounting | Horizontal only |
This model is particularly suitable for tight ceiling spaces, offering a compact, efficient solution for heating water. With its slim profile, the EHG25S can be easily accommodated in more constrained areas, making it perfect for the space-saving needs of BTO flats. The quick heating time and moderate capacity make it an excellent choice for small to medium-sized households needing a reliable hot water supply.
For larger households of up to six people, the Ariston INOX-40 is the top choice. This model features a robust stainless steel inner tank and is manufactured in Russia, known for its durable and high-quality workmanship.
Ariston Pro1 R INOX 40 H Technical Specifications:
Model Code | 3700647 |
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Capacity | 40 Litres |
Installation | Horizontal |
Power | 2.5 kW |
Voltage | 230 V |
Heating Time (ΔT=45°C) | 50 minutes |
Max Working Temperature | 67 °C |
Max Working Pressure | 8 bar |
Heat Dispersion | 1.32 kWh/24h |
Heating Element Material | Copper |
IP Protection | IP21 |
Net Weight | 12 kg |
Dimensions (W x H x D) | 719 x 353 x 381 mm |
Warranty | 5 years on tank, 1 year on heating element |
Safety Mark Number | 190387-11 |
The Ariston Pro1 R INOX 40 H is designed for larger households of up to six people, providing ample capacity and rapid heating to meet the demands of busy home environments. Its horizontal installation is space-efficient, fitting easily into BTO utility areas or service yards. The stainless steel tank, copper heating element, and a comprehensive warranty ensure long-lasting performance and reliability. This model is an excellent choice for those who need a larger water heating solution that combines efficiency with advanced features.
Conclusion
Choosing the right storage water heater for your BTO flat involves considering your space, family size, and specific water usage needs. Whether you opt for the slim efficiency of the Ariston Slim RS20, the compact Ariston Andris2 15 RS, the slightly larger Rheem EHG25S, or the capacious Ariston INOX-40, each model offers a blend of performance and practicality suited to the unique constraints of BTO living. By selecting one of these top models, you can ensure a reliable hot water supply that meets both your spatial limitations and lifestyle demands.