BTO Ariston Storage Heater Replacement Guide
BTO Ariston Storage Heater Replacement Guide
The complete step-by-step guide for HDB homeowners — from model selection to legal compliance. Know exactly what you're paying for, before anyone arrives at your door.
- ⭐ 4.9/5 Google Rating
- PUB & EMA Licensed
- 1,200+ HDB Installations
- No Hidden Fees
We Don't Replace Your Heater.
We Fix Your Bathroom.
9 out of 10 HDB heaters we inspect were installed incorrectly by the previous contractor. Dangerously mounted tanks, missing drainpipes, wrong anchoring — these are the norm, not the exception. HomeOne corrects all of this as part of every job. Here's what we find, what the rules are, and what we do about it.
Which Tank Goes Where
Tank type determines mount position. This is not a preference — it is a structural safety requirement. The table below shows which models fit which position, and what happens when the beam is too shallow.
Slim Tanks — All Capacities
Slim2 LuxD WiFi · Andris Lux WiFi · Slim3 RS · Slim3 Top WiFi · Andris Slim RS
Minimum 300mm beam height required. Slim profile fits all standard HDB beams.
Square Tanks — Up to 30L
Andris2 LuxD WiFi 30L · Andris2 Top WiFi 30L · Andris2 RS 30L
If beam is less than 360mm height (15L), we switch to a 30L slim model at no extra charge. PRV may need exposed drainpipe (+$150).
Drum Tanks — Above 30L
Pro RS J · Pro R Slim · any tank >30L capacity
Cannot be beam-mounted. Full pipework rerouted. All four anchors into structural concrete. No exceptions.
Choose Your Model
SLIM3 RS
20L / 30L
from
$250
$250 (20L) / $280 (30L)
SLIM2 LUX D WI-FI
20L / 30L
from
$370
$370 (20L) / $410 (30L)
ANDRIS2 RS
15L / 30L
from
$210
$210 (15L) / $230 (30L)
ANDRIS2 TOP WI-FI
15L / 30L
from
$350
$350 (15L) / $380 (30L)
ANDRIS LUX WI-FI
15L / 30L
from
$370
$370 (15L) / $400 (30L)
PRO RS J
30L / 50L / 80L
from
$280
For households needing
large capacity
PRO R SLIM
30L / 50L / 80L
from
$240
For households needing
large capacity
SLIM3 RS
Space-saving slim design — beam side mount, fits all standard HDB beams from 300mm.
SLIM2 LUX D WI-FI
Smart slim heater — control via Ariston Net app, beam side mount
ANDRIS2 RS
Compact square design for 360mm beam conditions, suitable for tighter bathroom layouts.
ANDRIS2 TOP WI-FI
Singapore's first WiFi-enabled smart heater — square tank, beam side mount
ANDRIS LUX WI-FI
Premium square-beam WiFi model with upgraded control and a refined compact storage heater profile.
PRO RS J
Large capacity drum tank — concrete ceiling mount, for big households or heavy usage
PRO R SLIM
Large capacity drum tank — concrete ceiling mount, for big households or heavy usage
9 Out of 10 Existing Installations Are Wrong
These are not edge cases — they are the standard state of an HDB heater installed by a handyman. HomeOne corrects all four as part of every job.
Square Tank Overhang
① Square Tank — Turning Moment Not Countered
Reinstall the same square tank on the same beam regardless of depth. The bracket is a small shelf with two bolts only. The full back face of the tank must be flush against structural concrete for the beam to counter the turning moment from the tank's weight. If any part of the back overhangs the beam edge, the beam no longer counters that rotation — the two bolts alone resist a 30kg+ turning load.
If beam depth is less than 360mm, we switch to an equivalent 30L slim model. Its smaller back face fits fully within the beam, the turning moment is completely countered by the concrete face, and the installation is structurally correct. No extra charge for the model switch.
Drum Tank Bracket on Beam
② Drum Tank — Anchor Beyond Beam Edge
Mount the drum tank beam-side in the same position as before. A drum tank uses two ring brackets, each with two anchor bolts at opposite ends of the drum. All four anchor points must land on solid structural concrete. When the beam is not deep enough, the outer anchor falls at the beam edge or into hollow tile. That anchor provides zero structural resistance.
Drum tanks mount to the concrete ceiling — always. The correct structural position is ceiling mount, with all four anchors embedded fully into the concrete slab. Pipework is fully rerouted. No debate, no exceptions.
③ Three Compliance Failures — Visible Right Now
Look at your existing heater. These three failures are visible without any tools:
No yellow-green earth wire connecting both metal pipes to each other and to earth. This is an EMA requirement — without it, a fault current travels through the water and pipework. It is the most commonly skipped item and the most dangerous.
No brass double check valve on the cold water inlet. PUB requires this to prevent contaminated hot water from back-flowing into the building's mains supply. 90% of existing installations do not have one.
Wrong-rated connection units, undersized cable, or hand-rolled joints wrapped in tape instead of a proper junction box. An EMA inspection fails immediately on any of these.
④ Missing PRV Drainpipe — Almost Universal
Leave the PRV outlet unconnected — exactly as the previous installer left it. The Pressure Relief Valve exists to safely discharge hot water if the tank ever over-pressurises. With no drainpipe, that discharge goes directly onto your ceiling, floor, or into a cabinet with no controlled outlet. Every single existing installation we inspect has this missing.
A new SS304 stainless steel drainpipe routed to the nearest floor trap is included in every bundle without exception. It is not an optional extra — it is a PUB regulatory requirement and it is always done.
Before HomeOne vs After HomeOne
The left photo is a typical HDB heater as-found. The right is the same position after a HomeOne Premium Bundle installation. Every numbered component on the right was missing on the left.
What's missing:
- ❌ No equipotential bonding wire
- ❌ No double check valve
- ❌ No SS304 drainpipe
- ❌ No gate valve
- ❌ No junction box
- ❌ Rusty brass fittings only
All 7 components present:
- ① Junction Box ② 2.5mm SS636 Cable
- ③ Double Check Valve ④ Gate Valve
- ⑤ Equipotential Bonding Wire
- ⑥ SS304 Drain Pipe ⑦ SS304 Fittings
Choose Your Installation Bundle
90% of handymen offer only the basic swap. Below, you'll see exactly what each component does — and what happens if it's missing. Make an informed decision before you accept any quote.
Direct Replacement
$150
Basic labour only
Premium Bundle
$438
Maximum protection
Bare Minimum
$349
Legally compliant
Component Comparison — Why the Premium Bundle is Worth It
| Component | Direct ($150) | Premium ($438) ⭐ | Standard ($349) |
|---|---|---|---|
| Double Check Valve (PUB required) | ✕ | ✓ | ✓ |
| Gate Valve (heavy duty) | ✕ | ✓ | ✕ |
| SS304 Drain Pipe (no rust) | ✕ | ✓ | ✕ |
| Equipotential Bonding | ✕ | ✓ | ✓ |
| 2.5mm SS636 Cable | ✕ | ✓ | ✓ |
| PUB Certificate Issued | ✕ | ✓ Full cert | Submission only |
| EMA RCCB Safety Test | ✕ | ✓ Documented | ✓ |
Your Ariston Warranty is Void if Installed by an Unlicensed Party
Ariston Singapore requires all storage heaters to be installed by a PUB Licensed Plumber and EMA Certified Electrical Worker for the manufacturer's warranty to be valid. A cheap $150 handyman installation effectively voids your 2-year warranty the moment they walk out the door. HomeOne is the only installer in Singapore that is simultaneously an Ariston Authorised Dealer, PUB Licensed, and EMA Licensed.
HomeOne vs Other Authorised Dealers vs Handymen
Being authorised by Ariston does not automatically mean legally licensed to install. Most authorised dealers are showrooms — they outsource installation to whoever is cheapest.
| Credential | HomeOne ⭐ | Other Authorised Dealers | Typical Handyman |
|---|---|---|---|
| Ariston Authorised Dealer | ✓ UEN: 202010424N | ✓ Yes | ✕ No |
| PUB Licensed Plumber on every job | ✓ Always | ⚠ Outsourced — varies | ✕ Almost never |
| EMA Certified Electrical Worker | ✓ Always | ⚠ Outsourced — varies | ✕ Almost never |
| PUB Certificate issued to homeowner | ✓ Yes — filed & issued | ⚠ Sometimes | ✕ No |
| Genuine Ariston units (not grey market) | ✓ Direct supply | ✓ Yes | ⚠ Unverifiable |
| Ariston warranty fully honoured | ✓ Guaranteed | ⚠ Depends on installer | ✕ Likely void |
| Itemised, fixed-price quotation | ✓ Always | ⚠ Varies | ✕ Rarely |
Order Summary
This is what a proper HomeOne order looks like. When a contractor gives you a generic quote with no itemisation — ask them to match this. Most won't be able to.
What’s Inside a Premium Bundle Installation
Junction Box
Safe electrical routing enclosure
EMA Required2.5mm SS636 Cable
Certified electrical cabling
EMA RequiredDouble Check Valve
Prevents water backflow into mains
PUB RequiredHeavy Duty Gate Valve
Durable isolation shutoff valve
PUB RequiredEquipotential Bonding
Earth bonding wire — prevents shock
EMA RequiredSS304 Drain Pipe
Rust-proof 0.99m drainage pipe
PUB RequiredStainless Steel Fittings
Corrosion-resistant pipe connectors
Best PracticeFull PUB Certificate
Official SP Services form CS/SH issued to you
Issued to YouHomeone Water Heater Pte Ltd
homeone.com.sg | 6742 6770
Schedule Your Installation
Minimum 48-hour notice required to schedule a licensed PUB plumber and EMA LEW for your slot.
Authorised. Licensed. Certified. All Three.
Most contractors have one of these. We have all three — verifiable by government and manufacturer records.
The Only Triple-Verified Ariston Installer in Singapore
HomeOne Water Heater Pte Ltd holds simultaneous authorisation from Ariston Singapore, a PUB Plumbing Licence, and EMA electrical certification. Every single job is documented with a paper trail that protects you legally and preserves your product warranty.
Search results from Ariston Singapore’s official Store Locator — exactly as it appears on their website:
The HomeOne group appears multiple times in Ariston’s official dealer database — confirming our long-standing authorised partner status across multiple business entities.
Verify this yourself on Ariston.com →Full Compliance Filing
We handle all Form CS/SH submissions to SP Services Ltd. You get the certificate — not a verbal assurance.
4.9/5 Google Rating
Over 1,200 documented HDB installations. Transparent pricing means no bad surprises — and no bad reviews.
Licensed Professionals Only
All work supervised by PUB Licensed Plumbers and EMA Certified Electrical Workers. No unlicensed subcontractors, ever.
From Our Licensed Pros
Why Your HDB Needs a PUB Double Check Valve
Understanding the compliance component that 90% of cheap installations skip — and why PUB will flag your home without it.
Read article →Electrical Safety: Burnt Boxes & Faulty Switches
Identifying burnt connection boxes or faulty heater switches before they become a fire hazard — or an EMA fail.
Read article →Related Articles
