System Boilers
Powerful hot water for larger homes. Multiple taps at once. From £2,000 fitted
Get Free Quotes from InstallersWhat is a System Boiler?
A system boiler heats water and stores it in a hot water cylinder, so you always have a ready supply of hot water for multiple taps and showers simultaneously. Unlike combi boilers, system boilers can supply several bathrooms at once without losing pressure or temperature.
System boilers have most components built-in (pump, expansion vessel, pressure gauge), making installation simpler than traditional regular boilers. They're ideal for larger homes with 2+ bathrooms and high hot water demand, delivering powerful, consistent hot water even with low mains pressure.
System Boiler Benefits
Multiple Taps
Supply 2+ bathrooms simultaneously without pressure drop
High Flow Rates
Powerful showers - 20-30L per minute from stored water
Works With Low Pressure
Doesn't rely on mains pressure - ideal for rural areas
Large Hot Water Store
120-300L cylinder - enough for whole family
Solar Compatible
Easy to add solar thermal panels to preheat water
Efficient
90-95% efficient A-rated models available
System Boiler Costs
+ Hot Water Cylinder Cost
Add £500-£1,200 for cylinder if you don't have one (120-300L size)
0% Finance Available
Pay from £70-£120/month with interest-free finance
Is a System Boiler Right for You?
✓ Perfect For:
- • Larger homes with 2+ bathrooms
- • High hot water demand (multiple showers at once)
- • Properties with low mains water pressure
- • Homes with power showers or large bath
- • Properties with existing hot water cylinder
- • Homes planning to add solar thermal panels
⚠ Consider Combi Boiler If:
- • Small home with 1 bathroom
- • Limited space (no room for cylinder)
- • Good mains water pressure
- • Lower upfront cost is priority
System vs Combi vs Regular
| Feature | System | Combi | Regular |
|---|---|---|---|
| Multiple taps | ✓ Excellent | △ Limited | ✓ Excellent |
| Space required | Cylinder only | ✓ Minimal | ✗ Tanks + cylinder |
| Low mains pressure | ✓ Works well | ✗ Poor | ✓ Works well |
| Installation cost | £2,000-£3,000 | £1,800-£2,500 | £2,200-£3,500 |
Quick Grant Finder
Answer 3 quick questions to see which grants you may qualify for
Ready for a System Boiler?
Get free quotes from Gas Safe registered installers. 0% finance available
Get Free Quotes from Installers