Tankless or Storage? Picking the Right Water Heater for a KL Condo
The single question we get more than any other on quote visits. Here's how we actually answer it — without trying to sell you the more expensive option.
Five years ago, "tankless or storage" had an obvious answer: storage. Tankless was either feeble (the instant heaters most KL apartments still have above the showerhead) or extravagant (gas units that couldn't legally be installed in a high-rise anyway). That changed once 7-9 kW single-phase electric tankless units became reliable, and condensing gas tankless became practical for landed homes with a balcony route for the flue.
The honest summary
If your household showers two-at-a-time, storage. If you live alone or shower one-at-a-time, tankless. Everything else is detail.
Storage cylinders — the case for
- Steady temperature even when two showers run simultaneously
- Lower kilowatt draw — usually 2-3 kW — fits within older condo MCB ratings
- Can be paired with solar thermal collectors on the roof for landed homes
- Quieter operation; no flow-sensor click
- Cheaper repair: corroded element is a 30-minute swap, not a PCB replacement
Storage cylinders — the case against
- Take wall or ceiling space — typical 50-litre unit is 60 cm tall and 45 cm deep
- Re-heat cycle uses energy even if you don't use the water
- Limescale builds up inside the tank, needing descaling every 18-24 months
- Heavy when full — needs proper bracket and structural wall, not just gypsum board
Tankless — the case for
- No standby loss — heats only when you open the tap
- Compact: roughly shoebox-sized, fits inside a kitchen cupboard or behind a wall panel
- Lifespan of 15+ years for premium units like the Stiebel Eltron DHE
- Unlimited hot water — never runs out mid-shower
Tankless — the case against
- High instantaneous current draw — 9 kW units need a dedicated 40A circuit
- Temperature drops noticeably when a second outlet opens during use
- PCB repair is the most expensive heater service we sell — RM 480 to 720 typical
- Needs higher inlet pressure than older buildings always provide
What we'd actually fit in your condo
The default recommendation for a one-bathroom KL condo with up to two occupants: a 7 kW electric tankless from Joven or Ariston. Compact, energy-efficient, capable enough.
For a two-bathroom unit with morning rush hour: a 50-litre storage cylinder on a dedicated 2 kW circuit, plus a small 3.5 kW instant unit at the secondary shower for backup. That stack handles a family of four without ever running out, and outlives a single tankless of equivalent capacity.
Whichever route you go, the install matters more than the brand. A great heater on bad pipework will outperform a luxury heater on stressed copper every time.
If you're not sure, send us a photo of the existing unit nameplate, the bathroom layout and the consumer unit. We'll quote both routes side by side — no obligation either way.