When a combi suits the house
A combi heats hot water as you use it and does not need a separate hot water cylinder. It can work well where space is tight and hot water demand is straightforward.
When a system boiler and cylinder make sense
A system boiler works with a hot water cylinder. That stored supply can be a better fit for a larger home or several bathrooms where taps and showers may be used together.
What I check before recommending either
I check the incoming water supply, the existing pipework, the number of bathrooms, the available cylinder space and how the household actually uses hot water.
- How many showers or taps run at the same time
- Whether there is room for a suitable cylinder
- The existing boiler and pipe layout
- The heating load and radiator sizes
- The budget for the complete installation