Description
The Star Rating Is About Standing Loss.
Not About How Fast It Heats.
A 25 litre storage geyser built around hard water and efficiency · BEE 4-star rated, with energy-saving high-density CFC-free PUF insulation holding down the heat a tank loses all day · a coated anti-rust inner tank engineered for hard water · an Mcoloy heating element that resists the corrosion and scaling hard water causes · 0.8 MPa — 8 bar — working pressure with a multi-function safety valve, suiting high-rise flats and pump-fed lines · 2000 W · wall mounted · 39 × 55.3 cm and 11.4 kg empty · White Grey
4 Star
ratedwhat the rating actually measures
A star rating on a storage water heater measures something specific, and it is worth knowing what. It is not about how quickly the geyser heats — it is largely about standing heat loss. A storage geyser heats a tank of water and then loses that heat steadily to the bathroom, switching on again and again to hold the temperature. That slow bleed, rather than the initial heating, is where most of a geyser's electricity goes in a household that leaves it switched on. A 4-star rating means denser insulation holding that loss down. The practical consequence is that the rating matters most in proportion to how long the unit stays energised. If you switch the heater on twenty minutes before bathing and off afterwards, you are already avoiding most standing loss. If it stays on through the day, as it does in most homes in winter, the insulation is where the difference on the bill comes from.
"Engineered for hard water" — what that consists of
Hard water attacks a geyser in two separate places, and this model addresses both. The tank is attacked by corrosion: dissolved minerals working on the steel until it perforates, usually at a weld or at the base. The coated anti-rust inner tank is the barrier against that, and a perforated tank is the failure that cannot be repaired. The element is attacked by scale: mineral deposits bake onto the hottest surface in the tank and insulate it, so it draws the same power for less heat until it eventually burns out. The Mcoloy element is built to resist that specific failure. Both matter in Delhi, where water hardness is often what decides whether a geyser lasts four years or eight. Neither eliminates the problem — periodic descaling is still worth doing — but they slow it considerably, which is the point of a hard-water-specific model rather than a generic one.
8 bar and a multi-function valve — the specification to check for a flat
This unit is rated to 0.8 MPa, or 8 bar, which is the top of the range for a domestic geyser and the figure worth checking if you live on an upper floor. Mains pressure in a tall building, or from an overhead tank several floors above, can be considerably higher than in a ground-floor house, and higher again where a pressure pump has been fitted to improve the shower. A tank rated below the pressure it actually sees is being stressed continuously and tends to fail early, usually as a leak at a joint years before it should. The multi-function safety valve releases pressure before it can climb past the rating as water expands during heating, which is why it must never be blocked, adjusted or removed. It is worth asking any competing model for its pressure rating before comparing on price alone.
🎯 Suited to
25 litres suits two people bathing one after another, or one unhurried shower. The unit is 39 × 55.3 cm and 11.4 kg empty — full, it carries roughly 25 kg of water in addition, so the wall and fixings must be sound.
CFC-free and denser than standard. This is the component doing the work behind the 4-star rating — less radiant heat loss, fewer reheat cycles.
Built to resist corrosion and scaling in hard water. The element is where scale forms first, so this is where hard-water resistance counts.
Releases excess pressure before it can exceed the tank's 8 bar rating. Occasional dripping during heating is the valve doing its job.
Light for a 25 litre tank, though substantial once filled. Fixings must be rated for the filled weight, not the empty one.
| Brand / Model | Havells Monza Pro 4S — GHWVMPUWAG25 ✅ |
| Type | Storage water heater (geyser), wall mounted ✅ |
| Capacity | 25 litres ✅ |
| Energy Rating | BEE 4-star ✅ |
| Heating Element | Mcoloy — corrosion and scale resistant ✅ |
| Insulation | Energy-saving high-density CFC-free PUF ✅ |
| Working Pressure | 0.8 MPa (8 bar), with multi-function safety valve ✅ |
| Rated Power | 2000 W ✅ |
| Mounting | Wall ✅ |
| Dimensions (W × H) | 39 × 55.3 cm ✅ |
| Weight (Empty) | 11.4 kg ✅ |
| Colour | White Grey ✅ |
| Inner Tank | ⚠️ Coated anti-rust tank. The title states Feroglas and the description states Endurashield — these are different coating technologies. Please have us confirm which is fitted. |
| Warranty | ⚠️ No warranty durations are stated in supplier material for this model. Please have us confirm the tank, element and comprehensive terms in writing before purchase. |
| Voltage | Listed as 240 V; other Havells models in this range state 230 V, 1 phase, 50 Hz — confirm against the rating plate ⚠️ |
| Depth | Not stated in supplier material — ask us before planning a tight alcove ⚠️ |
| In the Box | Not stated — confirm with us whether flexi pipes, fasteners and the safety valve are included ⚠️ |
| Anode Rod | Not stated for this model ⚠️ |
| Standing Loss | Not stated in supplier material ⚠️ |
Why buy from Mahajan Electronics?
- Genuine Havells with brand warranty
- Warranty terms confirmed in writing before you buy
- GST invoice — save up to 18% on business purchases
- 24-hour delivery across Delhi NCR
- 45+ years of trust · rated 4.7 on Google
- Raja Garden · Jail Road · Dabri Mor
Check the pressure rating before you check the price.
Havells Monza Pro 4S · GHWVMPUWAG25 · 25 Litre Storage Water Heater · BEE 4-Star · Engineered For Hard Water · Coated Anti-Rust Tank · Mcoloy Element · 0.8 MPa (8 Bar) With Multi-Function Safety Valve · High-Density CFC-Free PUF Insulation · 2000 W · Wall Mount · 39 × 55.3 cm · 11.4 kg · White Grey
Please Note: The image shown is for reference purposes only. Actual product details, including the serial number and manufacturing date, may vary.
