Whole House Scale Centurion Sizing Chart
| Water Heater Type | Description | Typical Household / Use | Peak Flow (L/min) | Product Code Filter | Product Code Descaler | Product Code(s) Filter Plus Descaler Combined |
|---|---|---|---|---|---|---|
Combi Boilers |
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| 24kW Combi Boiler | A small white box on the wall, usually in a kitchen cupboard. It heats your radiators and gives you hot water instantly when you turn on a tap. There is no separate hot water tank. | Small flat or small house with 1 bathroom. Best where only one shower is used at a time. | 10 L/min WH16COMB |
WH16FIL | WH16SC | WH16COMB |
| 28–30kW Combi Boiler | A wall-mounted white box that heats your home and provides stronger hot water flow than smaller models. No hot water tank is needed. | Typical 2–3 bedroom family home with 1 bathroom. Can comfortably run one shower. | 13 L/min WH16COMB |
WH16FIL | WH16SC | WH16COMB |
| 31–35kW Combi Boiler | A larger wall-mounted boiler that heats your home and provides good water pressure. Still no separate hot water cylinder. | 3–4 bedroom home with 1–2 bathrooms. Can handle a shower and a tap running together. | 16 L/min WH16COMB |
WH32FIL | WH32SC | WH32COMB |
| 36–42kW Combi Boiler | A powerful wall-mounted unit for bigger homes. It heats your radiators and gives strong hot water without needing a separate tank. | Large 4–5 bedroom house with multiple bathrooms and higher shower use. | 20 L/min WH32COMB |
WH32FIL | WH32SC | WH32COMB |
| Combi Gas + Electric Boost | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 18–25 L/min WH32COMB |
WH32FIL | WH32SC | WH32COMB |
Gas Boiler System |
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| Gas Tankless Water Boiler | A wall-mounted gas unit that heats water instantly when you turn on a tap. There is no storage tank. | Whole home hot water where no cylinder is installed. | 15–30 L/min WH32COMB |
WH32FIL | WH32SC | WH32COMB |
Unvented Boilers aka System Boilers |
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| System Boiler + Small Unvented Cylinder (up to 120L) | A wall-mounted boiler connected to a large pressurised hot water tank, usually silver and kept in an airing cupboard. | Family homes with 2–3 bathrooms needing strong water pressure. | 20-25 L/min WH32COMB |
WH32FIL | WH32SC | WH32COMB |
| System Boiler + Small Unvented Cylinder (120–150L) | A wall-mounted boiler connected to a large pressurised hot water tank, usually silver and kept in an airing cupboard. | Family homes with 2–3 bathrooms needing strong water pressure. | 25-35 L/min WH32FIL + UKWF-SC60 |
WH32FIL | UKWF-SC60 | WH32FIL + UKWF-SC60 |
| System Boiler + Medium Cylinder (180–210L) | A wall-mounted boiler connected to a large pressurised hot water tank, usually silver and kept in an airing cupboard. | Family homes with 2–3 bathrooms needing strong water pressure. | 40–50 L/min WH32FIL + UKWF-SC60 |
WH32FIL | UKWF-SC60 | WH32FIL + UKWF-SC60 |
| System Boiler + Large Cylinder (250–300L) | A wall-mounted boiler connected to a large pressurised hot water tank, usually silver and kept in an airing cupboard. | Family homes with 2–3 bathrooms needing strong water pressure. | 50–65 L/min WH32FIL + UKWF-SC80 |
WH32FIL | UKWF-SC80 | WH32FIL + UKWF-SC80 |
| System Boiler + Very Large Cylinder (300–500L) | A wall-mounted boiler connected to a large pressurised hot water tank, usually silver and kept in an airing cupboard. | Family homes with 2–3 bathrooms needing strong water pressure. | 60–80 L/min WH32FIL + WH32FIL + UKWF-SC114 |
WH32FIL+WH32FIL | UKWF-SC80 | WHS9000 + UKWF-SC114 |
Regular / Conventional Boilers "Old Style" |
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| Conventional / Gravity Fed boilers | An older style system with a boiler, a hot water tank in the airing cupboard, and a cold water tank in the loft. | Older properties built before modern combi boilers became common. | varies Find Your Flow Rate |
options available | options available |
Find Your Flow Rate https://www.uk-water-filters.co.uk/pages/water-flow-rates-finding Please contact us https://www.uk-water-filters.co.uk/pages/contact-us |
Electric Water Heaters |
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| Direct Electric Water Heater (Point-of-Use) | A small unit fitted under a sink that heats water just for that tap only. It works instantly and does not store water. | Single sink in a cloakroom, office, extension or small space. | 6–12 L/min WH-MINI-COMB |
WH-MINI-FIL | WH-MINI-SC | WH-MINI-COMB |
| Storage Electric Water Heater (Small) | A small upright hot water tank, usually stored in a cupboard. It heats and stores water ready to use. | Flat, studio or small property with one bathroom. | 8–12 L/min WH-MINI-COMB |
WH-MINI-FIL | WH-MINI-SC | WH-MINI-COMB |
| Storage Electric Water Heater (Medium) | A medium-sized hot water cylinder kept in an airing cupboard. Stores enough water for baths and showers before reheating. | Standard family home with one main bathroom. | 12–18 L/min WH32COMB |
WH32FIL | WH32SC | WH32COMB |
| Storage Electric Water Heater (Large) | A tall hot water tank that stores a large amount of hot water for the home. | Large household with 2–3 bathrooms needing more stored hot water. | 18–25 L/min WH32COMB |
WH32FIL | WH32SC | WH32COMB |
| Instant Electric Water Heater | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 4–8 L/min WH-MINI-COMB |
WH-MINI-FIL | WH-MINI-SC | WH-MINI-COMB |
| Commercial Instant Electric | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 20–30 L/min WH32COMB |
WH32FIL | WH32SC | WH32COMB |
| Hybrid Condensing + Electric | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 20–30 L/min WH32COMB |
WH32FIL | WH32SC | WH32COMB |
Air Source Heat Pump (ASHP) |
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| Air-to-Water Monobloc | A large outdoor unit (similar to an air conditioning box) that takes heat from the air outside and uses it to heat your home and hot water tank. | Modern, well-insulated family home looking for lower running costs and greener heating. | 22–28 L/min WH32COMB |
WH32FIL | WH32SC | WH32COMB |
| Air-to-Water Split | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 22–35 L/min WH32FIL + UKWF-SC60 |
WH32FIL | UKWF-SC60 | WH32FIL + UKWF-SC60 |
| High-Temperature ASHP | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 22–35 L/min WH32FIL + UKWF-SC60 |
WH32FIL | UKWF-SC60 | WH32FIL + UKWF-SC60 |
| Air-to-Air (Mini-Split) | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 15–22 L/min WH32COMB |
WH32FIL | WH32SC | WH32COMB |
| Multi-Split ASHP | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 15–28 L/min WH32COMB |
WH32FIL | WH32SC | WH32COMB |
| Hybrid Heat Pump + Boiler | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 22–35 L/min WH32FIL + UKWF-SC60 |
WH32FIL | UKWF-SC60 | WH32FIL + UKWF-SC60 |
| Exhaust Air Heat Pump | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 15–22 L/min WH32COMB |
WH32FIL | WH32SC | WH32COMB |
| Commercial Rooftop Heat Pump | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 45–90+ L/min Options Available Please Contact Us |
options available | options available |
Find Your Flow Rate https://www.uk-water-filters.co.uk/pages/water-flow-rates-finding Please contact us https://www.uk-water-filters.co.uk/pages/contact-us |
| VRF / VRV Heat Pump System | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 45–100+ L/min Options Available Please Contact Us |
options available | options available |
Find Your Flow Rate https://www.uk-water-filters.co.uk/pages/water-flow-rates-finding Please contact us https://www.uk-water-filters.co.uk/pages/contact-us |
Ground Source Heat Pumps (GSHP) |
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| Horizontal Loop GSHP | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 28–35 L/min WH32FIL + UKWF-SC60 |
WH32FIL | UKWF-SC60 | WH32FIL + UKWF-SC60 |
| Commercial Closed Water Loop System | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 60–150+ L/min Options Available Please Contact Us |
options available | options available |
Find Your Flow Rate https://www.uk-water-filters.co.uk/pages/water-flow-rates-finding Please contact us https://www.uk-water-filters.co.uk/pages/contact-us |
Storage (Tank) IMMERSION Water Heaters |
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| ASHP + Medium Cylinder (210–250L) | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 35–45 L/min WH32FIL + UKWF-SC60 |
WH32FIL | UKWF-SC60 | WH32FIL + UKWF-SC60 |
| ASHP + Large Cylinder (300–400L) | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 45–60 L/min WH32FIL + UKWF-SC80 |
WH32FIL | UKWF-SC80 | WH32FIL + UKWF-SC80 |
Indirect Storage Water Heater |
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| Indirect Water Heater | Heating or hot water system designed for residential use. | Suitable for standard household use depending on size and demand. | 15–30 L/min WH32COMB |
WH32FIL | WH32SC | WH32COMB |
Thermal Storage System |
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| Large Domestic Thermal Store (400–600L) | A very large, well-insulated hot water tank that stores heat like a battery for later use. | Large homes or properties with high hot water demand such as multiple bathrooms or large baths. | 70–90 L/min WH32FIL + WH32FIL + UKWF-SC114 |
WH32FIL+WH32FIL | UKWF-SC144 | UKWF-SC80 or UKWF-SC114 |
