The Main 120 Litre Direct Unvented Hot Water Cylinder (720635901) is a UK-manufactured, stainless steel cylinder designed to deliver reliable mains-pressure hot water for properties without access to mains gas. Heated directly by two factory-fitted Incoloy 800 immersion heaters, this cylinder is the perfect choice for all-electric homes, flats, and properties on solar PV or off-peak tariffs.

At Getplumb, we offer the best trade prices on the full Main unvented cylinder range — backed by a 25-year warranty on the stainless steel inner vessel and a one-year parts and labour warranty.

The coil-in-coil heat exchanger ensures rapid recovery, while 50mm of factory-injected polyurethane foam insulation minimises heat loss and running costs. KIWA approved for compliance with Water Regulations and Building Regulation G3.

Key Features:

• Capacity: 120 litres direct-fed unvented hot water
• Heating: 2 × 3.0kW Incoloy 800 alloy immersion heaters @ 240V
• Inner Vessel: high-grade stainless steel, 15 bar pressure tested
• Insulation: 50mm CFC/HCFC-free polyurethane foam
• Operating Pressure: 3.5 bar
• Maximum Flow Rate: up to 55 l/min @ 6 bar
• Thermostat: adjustable 10–70°C with 80°C high-limit cut-out
• Connections: 22mm compression / ¾" BSP
• Supplied with: 12 litre expansion vessel, T&P relief valve, pressure reducing valve, factory-fitted controls
• Approvals: KIWA approved, Building Regulation G3 compliant, CE marked
• Manufactured: in the UK by Baxi (Main Heating)
• Warranty: 25 years on stainless steel inner vessel, plus 1 year parts & labour

Specification Table:

Pairs perfectly with the Main Eco Compact System or Main Eco Elite System boilers for a complete domestic hot water solution. Suitable for use with solar PV systems and off-peak electricity tariffs.

Order online for UK delivery or collect from our Reading trade counter.

At GetPlumb, we strive to provide reliable and cost-effective delivery options to our customers. Please review our shipping policy below.

🆓 Free Local Delivery (Orders £60 & above)

We offer FREE delivery on orders £60 or more for selected local areas.

Eligible Postcodes Include:

• RG*
• SL*
• OX10*, OX11*, OX49*
• HP1*, HP3*, HP8*, HP9*, HP10*, HP11*, HP12*, HP13*, HP14*
• WD*, HA*, UB*, TW*, KT*
• W1* – W9*
• NW*, SW*

Delivery Time: 2–4 working days
Shipping Cost: £0.00

📦 Standard Shipping (Weight-Based Rates)

For orders that do not qualify for free delivery, standard shipping rates apply based on total cart weight.

• For cart weight between 0–5 kg, the shipping cost is £2.99 with a delivery time of 2–4 working days.
• For cart weight between 5–25 kg, the shipping cost is £7.99 with a delivery time of 2–4 working days.
• For cart weight between 26–40 kg, the shipping cost is £15.98 with a delivery time of 2–4 working days.
• For cart weight of 41 kg and above, the shipping cost is £31.96 with a delivery time of 2–4 working days.

🧱 Block Salt (Harvey’s) – Unit-Based
Shipping

This rate applies only to Harvey’s block salt products.

• £7.99 is charged for every 3 items.
• The charge increases by £7.99 for each additional set of 3 items.

Examples:

• 1–3 items → £7.99
• 4–6 items → £15.98
• 7–9 items → £23.97

Delivery Time: 2–4 working days

📏 Large / Long Items (Length-Based Shipping)

For oversized items where the product length is 1.5 metres or more:

Conditions:

• Product length ≥ 1.5 m
• Cart weight ≤ 40 kg

Shipping Cost: £18.00 (flat rate)
Delivery Time: 2–4 working days

Collection from Store

Customers can also choose to collect their order from our store in
Reading, UK, at no additional charge.

For any questions regarding shipping, please contact our support team at online@getplumb.co.uk.