Blue Diamond C21-014 MultiTank™

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Blue Diamond C21-014 MultiTank™ — Multi-Line Condensate Collection TankThe Blue Diamond MultiTank™ is a flexible multi-line condensate collection tank specifically engineered for s eamless integration with BlueDiamond® MaxiBlue® and MegaBlue® condensate pumps. Designed to consolidate up to six independent condensate drainage lines into a single collection point, it simplifies complex HVAC installations — particularly well-suited for ceiling-mounted units or remote locations where space is at a premium.Using thermistor sensing technology rather than traditional float switches, the MultiTank™ has no moving parts to clog, stick, or seize — delivering reliable, low-maintenance performance in demanding environments. Backed by a 3-year warranty.Key Features Up to 6 condensate drain lines — consolidates multiple lines into a single collection point Thermistor sensing — no moving parts, no float switches to clog or stick Ultra-quiet: 23 dB(A) — suitable for noise-sensitive environments 1.5 litre tank capacity — handles systems up to 50kW total DIN plug connection — compatible with MaxiBlue and MegaBlue pumps Inlet sizes: 20, 25, 27mm — flexible connection to multiple drain line diameters 8mm straight outlet 0.5m alarm lead Lightweight at 600g — easy to handle and position during installation 3-year manufacturer warranty Applications Mini-split systems up to 3.5kW per unit (up to 50kW total system) Multi-split and VRF/VRV systems with multiple indoor units Ceiling-mounted cassette units and concealed installations Offices, libraries, and areas where sound suppression is a priority Technical Specifications Specification Value Part Number C21-014 Brand Blue Diamond / Charles Austen Pumps Dimensions 355 × 126 × 115mm Weight 600g Tank Capacity 1.5 litres (0.4 gallon) Inlet Size 20, 25, 27mm Outlet 8mm straight Alarm Lead 0.5m Connection DIN plug Sensing Technology Thermistor (no moving parts) Noise Level 23 dB(A) Compatible Pumps MaxiBlue, MegaBlue Max Condensate Lines 6 Max System Capacity 50kW Warranty 3 years What's Included1 × Blue Diamond C21-014 MultiTank™Frequently Asked QuestionsWhich pumps is the MultiTank compatible with?The MultiTank™ is compatible with the Blue Diamond MaxiBlue® and MegaBlue® condensate pumps. It connects via DIN plug and is not compatible with MiniBlue models.How many condensate lines can the MultiTank handle?The MultiTank™ can consolidate up to six independent condensate drain lines into a single collection point, supporting systems up to 50kW total capacity.Does the MultiTank use a float switch?No — the MultiTank™ uses thermistor sensing technology, which monitors temperature inside the tank rather than relying on a float switch. This eliminates the risk of clogging or sticking and ensures consistent, reliable performance.What inlet sizes does the MultiTank accept?The MultiTank™ accepts inlet sizes of 20mm, 25mm, and 27mm, providing flexibility for connection to different drain line diameters.What is the warranty?The Blue Diamond MultiTank™ is backed by a 3-year manufacturer warranty.Related Products Blue Diamond F10-011 Mounting Feet (for MultiTank) Blue Diamond S09-036 Silencer Browse All Blue Diamond Condensate Pump Accessories Show more