COMBI
The range
Three routes to electric. One standard of detail.
Heat pumps when you want maximum efficiency. Boilers when you want a straight swap. Water heaters when you only need hot water. Cylinders to complete the system — every one designed in the UK.
The upward-firing heat pump.
- Whole-house low-carbon heating that drives the radiators you already have — up to 75°C, no rip-out
- Fires its air upward, not across the garden — sits close to a boundary, no cold draughts
- Heats in winter and cools in summer from the same unit
- Around three times the real-world efficiency of a traditional system
MCS-certified. Installed by an MCS-certified installer, qualifying homes in England and Wales can put a Boiler Upgrade Scheme grant towards it — up to £9,000 replacing oil, or £7,500 replacing a gas boiler. Scheme terms, funding and amounts change — checked on gov.uk, 2 July 2026.
Meet Vertex ↓
A straight swap, done properly.
- Heating and hot water from one compact wall-hung unit — no cylinder, no airing cupboard
- No flue, no fuel line — suits flats, apartments and smaller homes
- Virtually 100% efficient at the point of use
- Repairable for life rather than condemned — built around our serpentine heating element
A heat pump that lives indoors.
- Hot water from a heat pump built into the store — no outdoor unit at all
- Replaces an immersion-heated cylinder and brings the running cost down
- One appliance in one cupboard — breathes through two slim ducts
- 200 or 300 litres, stainless steel
The finishing touches
A complete portfolio. Every niche covered.
Those are the big three. These are the pieces that complete the system — the cylinders that pair with any of them, and the specialists built for the awkward brief. Few electric heating ranges go this deep.
Gas performance, electric power.
- A bath in an all-electric home — without fitting a cylinder
- Gas-like flow from an electric combi: up to 12 litres a minute with the tank full
- One wall-hung unit does heating and hot water
- 35-litre stainless-steel store built into the case
The All in One.
- Boiler and cylinder as one delivery, one install
- The boiler-to-cylinder plumbing is already done — minimal connections on site
- Heating and stored hot water from one upright unit, 580mm wide
- 150, 170 or 200 litres
Hot water, exactly where it’s needed.
- Hot water only while the tap runs — heat only what you use
- For the far tap: the cloakroom basin, the garden office, the workshop sink
- 85mm off the wall — fits where nothing else will
- Up to 12 L/min three-phase where a shower or kitchen needs real flow
Heat pump cylindersHigh-efficiency coil sized for a monoblock — standard, slimline, buffered, solar, horizontal or pre-plumbed.120–600LCapacities475mmSlimlineThe brochures ↓
Prime2o unvented cylindersMains-pressure hot water, boiler-led or direct — duplex stainless steel, 10 bar, slimline and “Air” variants.60–300LDuplex steel25-yrGuarantee, T&Cs applyThe brochures ↓Support — literature
Downloads
Every brochure, flyer and installation manual we publish, by product family. Please bear with us while we update our literature to include our stunning new branding.
Integrated heat pumps — Cylinder & Cylinder Plus
Vertex Cylinder
Combi · System · Heat Only · All in One
Electric boilers
Instantaneous · point of use
Water heaters
Heat pump cylinders · Prime2o
Cylinders
Need a manual that isn’t here, or a declaration of conformity? Ask us: sales@stromltd.com.
About Strom
Family-owned. Independent. British.
Strom was established in 2012 in Ossett, West Yorkshire. Our team shares over 100 years’ combined experience in heating product design and manufacture — and it shows in the product, the support, and the detail.
Register your product.
Register within 45 days of purchase to activate your full warranty. You’ll need the serial number from the A4 card supplied with the product, and your proof of purchase.
Start registrationTalk to a real person.
Straight through to the team in the heart of Yorkshire — no call centre, no script, no hold music.
0333 344 24 74Warehouse 2, Sandbeds Trading Estate,
Ossett, West Yorkshire, WF5 9ND