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Swindon · Wiltshire
Combi vs System Boilers: Which Suits Swindon Homes?
Swindon's housing mix — 1930s semis, post-war estates, and large new-builds — throws up this question constantly. The right answer depends on water demand, not brand loyalty.
The short version
- Combi heats water directly on demand: no cylinder, no loft tank. Ideal for 1–2 bathroom homes with decent mains pressure.
- System heats water into a pressurised cylinder: strong simultaneous showers, works well in 2+ bathroom homes.
- Regular (heat-only) with loft tanks suits older systems with low mains pressure — increasingly replaced by system setups on reboiler jobs.
Comparison
| Factor | Combi | System |
|---|---|---|
| Hot water on demand | Yes, unlimited | Cylinder-limited |
| Two showers at once | Weak | Strong |
| Space needed | Least | Cylinder cupboard |
| Install complexity (swap) | Low | Medium |
| Indicative installed cost | £2,000–£3,500 | £2,500–£4,000 |
Swindon-specific notes
Hard-ish Wiltshire water scales up heat exchangers; a combi in a hard-water area benefits from annual servicing more than most. New-builds to the north of town generally have mains pressure that flatters combis, while older Old Town properties with original pipework sometimes need system upgrades to feed two bathrooms.
Prices are indicative 2026 UK installation ranges, not quotes. Any replacement must be installed by a Gas Safe registered engineer and notified under Building Regulations.