PLUMBING & ELECTRICAL
Discover our plumbing and electrical services.
Everything You Need Under One Roof
At Miller Wholesale, we specialise in supplying plumbers, electricians, and self-builders across Northern Ireland, including Belfast, Derry, and Donegal, with everything required for bathroom, heating, and plumbing projects. Our extensive product range ensures that tradespeople have access to high-quality, reliable materials and expert advice under one roof.
Plumbing & Heating Supplies
Miller Wholesale supplies, sizes and helps install high-efficiency heating systems across Northern Ireland
Cast iron & designer radiators supplied, sized and ready to install.
Traditional column radiators for period homes. Slim flat-panels for clean modern spaces. Arroll cast-iron options for that heritage look and slow-release warmth. We advise on outputs, pipe centres, finishes and matching valves.
- Outputs sized from bathrooms → large kitchen / living extensions
- Finishes & valves matched to your interior
- Compatible with boilers & low-temp underfloor
What you get
Radiators matched to the interior, heat demand and layout, not just “whatever fits”.
- Heat output calculation & sizing support
- Finish samples and valve matching
- Trade-friendly pricing
More details
Cast iron gives slow, even heat, perfect for older homes. Slim steel designer rads respond fast and sit tight against fresh plaster or tiled floors. We’ll help you pair towel rails and valves so everything lands as one clean visual.
Underfloor Heating
Wet and electric systems for new builds, extensions and retrofits, engineered for comfort and efficiency.
- Full design packs & manifold layouts
- Works with heat pumps & boilers
- Smart zoning & app control
More details
Low-profile boards for renovations, screed systems for new floors, and rapid-warmth electric mats for bathrooms. We calculate loops, flow rates and insulation, no guesswork on site.
Boilers
High-efficiency boilers, including trusted Grant models specified for reliability and long-term performance.
- Oil & gas options, internal & external
- Output sizing for hot water demand
- Controls & weather compensation
More details
We match boiler output, flue runs and cylinder pairing. Add smart controls and proper balancing for lower bills and quieter operation.
Oil Storage & Thermal Systems
Safe storage and smart heat management, including Maxi-pod thermal stores for efficient multi-source setups.
- Bundled tanks & compliant fittings
- Thermal stores for boilers, stoves & solar
- Legionella-safe hot water solutions
More details
We size tanks, advise on siting and bunding, and configure thermal stores for fast hot-water recovery and stable heating across zones.
Electrical & Hardware
Supplying everything from core electrical fittings to site hardware essentials, we provide reliable, trade-quality products for contractors and builders across Northern Ireland
Switchgear & Electrical
- Consumer units & distribution boards (surface / recessed)
- Protection: MCB, RCBO, RCD, AFDD, surge
- Labelling, DIN rail accessories, enclosures
Lighting
- LED downlights, panels, battens, architectural fittings
- Emergency packs, sensors & dimming control
- Indoor / outdoor IP rated, low glare options
Tools & Fixings
- Hand tools: drivers, pliers, levels, blades
- SDS bits, saw blades & accessories
- Fixings & sealants: screws, anchors, foams, adhesives
RENEWABLES
We supply Warmflow’s MCS-approved Zeno heat pumps for efficient, low-carbon heating.
Warmflow Renewables
High-efficiency Zeno heat pumps for modern homes and light commercial installs, available via Miller Wholesale.
Zeno R290 Air Source Heat Pumps
Three outputs (approx. 9–22 kW) using the latest R290 refrigerant for low-carbon, high-efficiency heating and hot water. Ideal for retrofits and new builds.
- MCS-approved renewable heating
- Compact, quiet outdoor unit
- Pairs with heat-pump cylinders & buffer tanks
Zeno Ground Source Heat Pumps
GS03 model delivering up to 18 kW on single-phase with an inverter-driven Copeland compressor for maximised efficiency.
- Stable seasonal performance
- Perfect with ground loops or boreholes
- Integrates with Warmflow cylinders