WaterBoost Mains Booster
Stuart Turner Mainsboost Upstream Monobloc 22/28mm 21104
- Established 1975
- Trusted by thousands of customers
Mainsboost Monobloc
A compact and easy to install integrated upstream unit exclusively for use with Stuart Turner Mainsboost systems.
The Mainsboost Monobloc 22/28mm provides an ultra-compact and rapid installation alternative to traditional 22 and 28mm Upstream Line-in Kits (ULKs) which use multiple separate components.
The Mainsboost Monobloc 22/28mm is an essential fitting in any Mainsboost installation and applies necessary regulation controls to the incoming cold-water mains supply required for WRAS approval and water authority compliance.
More about this product
Features –
- Simple and convenient installation
- Compact design
- WRAS Approved Materials
- 2 year warranty
Standard delivery:
Standard delivery is free on most orders. Some items may incur a delivery charge depending on weight, size or value. Any applicable charge will be displayed at checkout.
Deliveries will typically be made between 7am and 6pm, Monday to Friday (excluding public holidays).
Next day delivery:
Next working day delivery is available for a £16.50 + VAT delivery charge.
Orders must be placed before 12 noon to qualify for next working day delivery. Orders placed after 12 noon on Thursday but before noon on Friday will be delivered the following Monday. Orders placed after 12 noon on Friday will be delivered on Tuesday.
Pallet/Large/Difficult items:
Some large, heavy or difficult to transport items may incur an additional delivery charge. Please contact us for a delivery quote before ordering.
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Frequently Asked Questions
Quick answers to common questions about the Stuart Turner Mainsboost Upstream Monobloc 22/28mm 21104. For technical specifications, see the product details above; for sizing or installation advice, contact our team. If you have any other questions, we're happy to help.
What is an accumulator tank?
An accumulator tank is a pressurised vessel that connects directly to the mains supply and stores water under pressure. When a tap or shower opens, water discharges immediately from the vessel at full mains pressure rather than drawing only from the street main. This delivers stronger, more consistent flow at peak times. Accumulators have no pump and no moving parts so they are maintenance free and silent.
When should I use an accumulator instead of a pump?
An accumulator is the right solution when static mains pressure is adequate – above 2 bar – but flow is poor or drops during peak demand. It boosts available flow without adding a pump, energy use or noise. If static pressure is below 2 bar, a booster pump is needed instead, or an accumulator combined with a charge pump such as the WaterBoost ACF1.
What size accumulator do I need?
Accumulators are typically sized on a 60 per cent usable rule – a 300 litre vessel delivers around 180 litres of boosted water per cycle. As a guide, a 2 to 3 bedroom home suits a 300 litre vessel such as the GWS GCB-300LV. Larger 4 to 5 bedroom homes or properties with multiple bathrooms typically need 450 to 600 litres. Vertical models save floor space, horizontal models suit lofts and roof spaces.