Combi Boilers in South Africa: Is Instant Gas Hot Water Worth It?
23 July 2026 · Plumbers On Duty
Combi Boilers in South Africa: Is Instant Gas Hot Water Worth It?
Combi boilers (gas-fired, no tank, instant hot water and central heating in one unit) are common in the UK but new to SA. Brands like Bosch, Vaillant and Ariston now import locally. Are they worth it?
Running cost, 4-person household
| System | Monthly energy | Notes |
|---|---|---|
| 200 L electric geyser | R680 to R1,100 | Off-peak timer helps |
| Heat pump + 200 L cylinder | R220 to R380 | Best efficiency |
| Solar geyser + electric backup | R150 to R450 | Weather-dependent |
| Gas combi (LPG) | R780 to R1,200 | LPG at R32 to R38 per kg |
| Gas combi (piped natural gas, JHB only) | R310 to R520 | Cheapest gas option |
Install cost (2026)
- Combi unit: R28,000 to R52,000
- LPG installation with SAQCC gas certificate: R12,000 to R22,000
- Flue and pipework: R6,000 to R11,000
- Total: R46,000 to R85,000
A heat pump retrofit is R28,000 to R42,000 all-in, with lower running cost. Solar geyser is R32,000 to R55,000.
When a combi wins
- No roof space for solar or heat pump
- Piped natural gas available (Joburg CBD, parts of Sandton)
- You want central heating radiators too
- Multiple bathrooms used simultaneously (with a 32 kW+ unit)
When it loses
- Rural or coastal (LPG delivery cost)
- Load shedding (needs electricity for the fan and controls)
- You already have a working solar/heat pump geyser