Description
✅ 7-Year Tank · 4-Year Heating Element · 2-Year Comprehensive Warranty — Authorised AO Smith Partner · 100% Genuine · Mahajan Electronics Since 1979
Made in India for Indian water conditions. 24-hour delivery Delhi NCR. GST invoice available. 4.7★ Google Rating.
💧 AO Smith 70L Storage Water Heater. Blue Diamond® Glass-Lined Tank. Glass-Coated Incoloy Element. 2X Anode Rod. PUF Insulation. 7-Yr Tank Warranty. HAS 70 RHS.
The AO Smith HAS 70 RHS is the large-capacity storage water heater for households and commercial setups that cannot compromise on hard-water durability, scale resistance, and heat retention. Blue Diamond® glass lining protects the inner tank from corrosion — critical in Delhi NCR's hard water supply; Glass-Coated Incoloy Heating Element resists scale formation from hard water minerals that kill standard elements within 2–3 years; 2X Long-Lasting Anode Rod extends tank life beyond conventional magnesium rods; Advanced PUF Insulation retains heat for longer, reducing the frequency and duration of heating cycles; 70L capacity serves large families and light commercial use; bottom inlet/outlet for easy plumbing. 7-year tank warranty — the longest coverage period in the product. Made in India for Indian water conditions.
Blue Diamond® Glass-Lined Tank — why inner tank coating is the most important specification for a water heater in Delhi NCR
Delhi NCR's municipal water supply is classified as hard to very hard — Total Dissolved Solids (TDS) in the 300–600 mg/L range across most of the distribution zone, with calcium and magnesium hardness typically between 150–400 mg/L as CaCO₃. When this water is heated inside a steel tank, two corrosion mechanisms accelerate dramatically: electrochemical corrosion (the calcium and magnesium ions in hard water create an electrolytic environment where the tank's steel inner surface oxidises, producing rust that contaminates the hot water and progressively weakens the tank wall); and scale formation (calcium carbonate and magnesium hydroxide precipitate out of solution as water temperature rises, forming hard mineral deposits on the tank interior that reduce effective tank volume, insulate the heating element from the water, and increase electricity consumption as the element works harder to heat water through the insulating scale layer). Standard water heaters use a thin glass frit coating on the inner tank — adequate for soft or moderately hard water but prone to micro-cracking under the thermal cycling stress of daily heat-up and cool-down cycles in hard water. AO Smith's Blue Diamond® glass lining uses a proprietary glass composition with a Coefficient of Thermal Expansion (CTE) engineered to match the CTE of the steel tank body — when the tank expands during heating and contracts during cooling, the glass lining expands and contracts at the same rate, preventing the micro-cracks that allow hard water to reach and corrode the underlying steel. The result is a glass-steel bond that maintains its integrity through years of thermal cycling in Delhi NCR's hard water conditions, preventing both corrosion contamination and structural weakening. The 7-year tank warranty is AO Smith's confidence commitment on this engineering — a coverage period that standard glass-lined geysers from other manufacturers rarely extend beyond 5 years.
Glass-Coated Incoloy Heating Element — the scale-resistant alternative to standard stainless steel elements
Standard water heater heating elements are made from stainless steel or copper — both functional in soft water but vulnerable to two failure modes in hard water: scale encrustation (calcium carbonate deposits build up on the element surface, creating an insulating layer that forces the element to operate at higher temperature to transfer the same heat to the water, eventually causing the element to overheat and fail — the most common cause of geyser element failure in Delhi NCR within 2–3 years of installation); and electrochemical corrosion (in hard water's electrolytic environment, bare metal elements corrode at contact points with scale deposits, developing pitting and eventually cracking the element sheath). Incoloy is a nickel-iron-chromium superalloy developed specifically for heating elements in corrosive environments — its chromium content (typically 19–23%) forms a passive oxide layer that resists both scale adhesion and electrochemical attack. The Glass Coating on AO Smith's Incoloy element adds a secondary protection layer — a smooth glass surface that scale deposits cannot bond to as readily as to bare metal, reducing build-up rate and extending the cleaning interval. The combination of Incoloy's corrosion resistance and the glass coating's scale resistance gives the HAS 70 RHS's heating element a significantly longer service life than standard elements in Delhi NCR's hard water, supported by the 4-year element warranty (double the standard 2-year coverage of most competing models).
Advanced PUF Insulation — heat retention that reduces electricity consumption between uses
PUF (Polyurethane Foam) insulation is injected between the inner tank and the outer body shell, filling the space completely with a closed-cell foam that has a thermal conductivity of approximately 0.022–0.026 W/m·K — roughly 5× better than standard mineral wool insulation used in economy water heaters and 20× better than air. In a storage water heater, insulation quality determines the "standby heat loss" — the rate at which a full tank of heated water loses temperature when the heater is not actively heating. A well-insulated 70L tank loses 1–2°C per hour; a poorly insulated tank of the same size loses 4–6°C per hour. For a household that heats the tank in the morning and draws hot water over a 2–3 hour period, the difference is measurable: a PUF-insulated tank delivers water at close to the set temperature throughout the draw period; a poorly insulated tank may deliver noticeably cooler water by the end. More importantly, the heating element cycles on to reheat the tank less frequently between uses — each reheat cycle consumes electricity. For a 70L commercial or large-family geyser that may be kept at temperature throughout the day, PUF insulation's standby loss reduction directly translates to lower monthly electricity bills.
2X Long-Lasting Anode Rod
The sacrificial anode rod is a consumable component suspended inside the tank — it corrodes preferentially to protect the tank's steel body, a process called cathodic protection. Standard geysers use magnesium anode rods, which corrode quickly in hard water (typical replacement interval 2–3 years). AO Smith's special alloy anode rod in the HAS 70 RHS is rated to last 2× longer than conventional magnesium rods — extending the tank protection interval and the time before the first anode replacement service is needed. In a 70L commercial-use geyser where maintenance access may be limited, the 2X anode life directly reduces service interruption frequency.
Bottom Inlet/Outlet Plumbing
Bottom inlet/outlet connections position both the cold water inlet and hot water outlet at the base of the unit rather than the top — a plumbing configuration that simplifies installation in vertical wall-mount positions where the supply and output pipes run from below. For a 70L geyser (which is significantly heavier than a 15L or 25L unit at full capacity — approximately 70kg when full), bottom connections allow the unit to be mounted high on the wall with all plumbing connections made at accessible working height rather than requiring the plumber to reach above the unit. The configuration also reduces air lock risk during filling.
Temperature Control Knob
Adjustable thermostat knob allows temperature setting from approximately 25°C to 75°C. For a large-family or commercial installation serving multiple users with different hot water preferences — a household with young children (safer at 40–45°C to prevent scalding), adults who prefer higher temperatures for bathing, and kitchen use (65°C+ for effective cleaning) — the adjustable thermostat allows a single geyser to serve all purposes by adjusting before each period of use, or by setting a compromise temperature appropriate for the primary use pattern.
Made in India for Indian Water
The HAS 70 RHS is manufactured in India specifically calibrated for Indian water conditions — the Blue Diamond® glass composition, Incoloy element specification, and anode rod alloy are all selected based on the TDS, hardness, and pH profiles of Indian municipal water supplies, which differ significantly from the water conditions that govern European and North American water heater specifications. An AO Smith product designed for Indian conditions performs materially better than an imported specification brought into the Indian market unchanged.
🎯 Ideal for
| Brand | AO Smith |
| Model | HAS 70 RHS |
| Capacity | 70 Litres |
| Type | Storage Water Heater (Electric Geyser) |
| Installation | Indoor — wall mount |
| Inner tank | Blue Diamond® Glass-Lined Steel — hard water rated |
| Heating element | Glass-Coated Incoloy — scale + corrosion resistant |
| Anode rod | Special alloy — 2× life vs magnesium rods |
| Insulation | Advanced PUF — polyurethane foam, low standby loss |
| Plumbing | Bottom inlet/outlet |
| Temperature control | Adjustable knob — ~25°C to 75°C |
| Power source | Corded Electric |
| Colour | White |
| Country of origin | Made in India |
| Warranty — tank | 7 Years |
| Warranty — element | 4 Years (2+2 extended) |
| Warranty — product | 2 Years Comprehensive |
🛡️ 3-Tier Warranty — Longest in Class
70L. Blue Diamond® Tank. Incoloy Element. 2X Anode. PUF Insulation. 7-Yr Tank Warranty. Order today.
India's hardest water. AO Smith's toughest tank. 24-hour delivery Delhi NCR. GST invoice. Genuine AO Smith — Mahajan Electronics since 1979.
Product image for reference. Warranty T&C apply — 7-year tank, 4-year element (2+2), 2-year comprehensive. Made in India for Indian water conditions.
Longer life in toughest water conditions with Blue Diamond® glass lined tank.
Glass-Coated Incoloy Heating Element Resistant to scale formation.
Advanced PUF Insulation High energy efficiency and power savings.
Long-lasting Anode Rod 2X lifespan as compared to normal magnesium rod.
Please Note: The image shown is for reference purposes only. Actual product details, including the serial number and manufacturing date, may vary.
Made in india
