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Stuart Turner MainsBoost MB 250SV-3-22 396 Litre Triple Vessel

MRRP £2,529.00 + VAT Our price £1,669.00 (+ VAT) Incl. VAT: £2,002.80
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Mainsboost systems are designed to stabilise water pressure and increase flow to combination boilers and unvented systems allowing multiple taps and showers to be used at the same time.

The Mainsboost MB 250SV features a nominal vessel size of 240 litres and a pressurised water holding capacity of approximately 132 litres.

Available in single, twin and triple vessel options, each unit is supplied with a comprehensive Upstream Line-In Kit (ULK) featuring 22 mm pipe diameter fittings.

Constructed from an epoxy coated steel body and a highly durable virgin butyl diaphragm, all Mainsboost vessels are WRAS Approved and come with a 5 year guarantee.

Designed for unvented systems where the mains is greater than 2.0 bar but water flow is inadequate.


  • Flow rate up to 80 litres/minute per vessel
  • 100 - 1000 litre capacity vessel options
  • Silent operation
  • Maintenance free
  • Consumes no electricity
  • Robust construction 
  • Long life butyl diaphragm
  • WRAS Approved product
  • 5 year guarantee
  • Includes comprehensive Upstream Line-in Kit (ULK) as standard
  • Suitable for boosting the cold water mains supply to residential and commercial properties
More Information
SKU 44463
Manufacturers Stuart Turner
Manufacturers Warranty 5 Years
GTIN 5050400444633
Weight 115.0 Kg
Dimensions 1210 x 535 x 535 mm Each Vessel
Connection Type 22mm
Max Flow 80 l/min
Max Pressure 1000 kPa (10 bar)
Material Mild Steel


We offer free standard delivery to any UK address on a 3-5 working day delivery time on all orders over the value of £60 + vat. This is not weight restricted

Next day delivery is charged at £8.50 + vat for items under 35kgs.  Orders need to be placed before 5pm Mon-Thurs or 4:30 on Friday for guaranteed Next Day Delivery.

Next day delivery is not avaialble for UK Highlands and Islands. Please click the following link to view postcodes/areas that don't qualify for next day delivery.

Due to some product specifications, there may be a lead time of up to 4 weeks. This is only on a small number of products and you will be contacted upon purchase and entitled to a full refund if required.

For Items over 35kgs, please review our delivery charges here

For full delivery terms please click here

International Delivery

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If you want your order delivered to a remote area please contact our one of our Sales Representatives on 0800 112 3134 before placing your order and we will assist you further.


Unused, unaltered items may be returned at the buyers expense for credit upon Online Pump Supplies prior written consent and upon the terms specified by Online Pump Supplies.  The buyer assumes all risk of loss of such returned goods until actual receipt and acceptance by Online Pump Supplies.  Please click here to view Returns information.

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