When I First Confused These Two Heaters
When I first started coordinating heating equipment for facility upgrades and event setups, I assumed any electric heater was basically the same box with a different output rating. Patio heater, storage heater—just wattage variations, right?
Three years and about 200 rush orders later, I realized I was completely wrong. A Dimplex storage heater and a patio heater serve fundamentally different jobs. Thinking they're interchangeable can cost you time, money, and credibility with clients.
Let's break this down by the dimensions that actually matter when you're choosing between them for a real project.
Comparing Across Dimensions: Storage Heater vs. Patio Heater
Dimension 1: Intended Use—Inside vs. Outside vs. Indirect
A Dimplex storage heater is designed for one thing: heating an indoor space over a long period, primarily using off-peak electricity. It stores heat in ceramic or brick cores overnight and releases it during the day. This is a whole-room heating strategy for homes, offices, or apartments. It's not portable. It's not instant. It's planned, steady heat.
A patio heater is designed for a completely different scenario: heating an outdoor or semi-outdoor area where people gather temporarily—restaurant patios, event tents, construction site break areas. It uses radiant heat to warm people directly, not the air around them. It runs on propane, natural gas, or electricity and produces heat immediately.
The contrast is sharp: storage heaters operate on a daily cycle inside. Patio heaters operate on demand, outside. Period.
Dimension 2: Operating Cost—Time-of-Use vs. On-Demand
Here's where the economics diverge. A Dimplex storage heater's whole value proposition relies on time-of-use electricity tariffs. In the UK, Economy 7 or similar plans offer cheaper electricity overnight. The storage heater charges up when power is cheap—roughly 7 pence per kWh off-peak vs. 15-20 pence per kWh daytime in 2024-2025 rates—and releases that heat during expensive peak hours.
The catch? If you don't have a time-of-use tariff, a storage heater loses its cost advantage. It becomes an expensive way to heat a room because you're paying peak rates to store heat you use later.
A patio heater doesn't care about time-of-use tariffs. Its operating cost is determined by fuel type and usage hours. A 12 kW propane patio heater burns roughly 0.9 kg of propane per hour. At roughly £2.50-3.00 per kg (2024-2025 average), that's £2.25-2.70 per hour. An electric patio heater? 2-3 kW at 15-20 pence per kWh equals 30-60 pence per hour. Electric is cheaper per hour—but the heat only warms people within a 2-3 meter radius, not the whole space.
Which is cheaper depends entirely on your scenario. For a restaurant patio used 6 hours a night, 4 nights a week? Electric patio heater at 40p/hour beats a propane unit at £2.50/hour. For a whole office building? Storage heater on off-peak rates wins.
Dimension 3: Installation and Setup—Permanent vs. Plug-In
A Dimplex storage heater is a permanent installation. It's hardwired to a dedicated circuit by a qualified electrician. The unit itself weighs 50-80 kg for a typical model. Installation requires:
- Electrical load assessment (most need 1.5-2.5 kW input per unit)
- Dedicated circuit with appropriate breaker
- Wall mounting or floor placement with clearance for airflow
- Typically 2-4 hours per unit for a pro installer
Patio heaters could not be more different. They're designed for mobility. A 2 kW electric patio heater plugs into a standard wall outlet (UK 13-amp, US 120V or 240V). A propane unit requires an LP cylinder and a regulator—that's it. Setup time: 5-15 minutes.
Last quarter, we processed 47 rush orders. I had one call at 2 PM from an event coordinator who needed heat for a tent by 6 PM the same day. Normal turnaround for a hardwired solution is 3-5 days. We found six 2 kW electric patio heaters at a local supplier, paid £200 in rush fees (on top of the £360 base cost), and delivered them by 4:30 PM. The client's alternative was cancelling the event. The storage heater option wouldn't have worked logistically.
Dimension 4: Heat Control and Comfort
Dimplex storage heaters have improved dramatically. Modern units include:
- Automatic charge control (adjusts heat input based on outdoor temperature)
- Individual room thermostats
- Programmable timers (some with 7-day scheduling)
- Fan-assisted output for faster heat release
But the fundamental limitation remains: you decide how much heat to store the night before. If a cold snap hits mid-day, you can speed up the fan but you can't generate more stored heat until the next night. Controllable? More than ever. Instant? No.
Patio heaters offer instant heat with immediate control. Turn the knob, heat appears. Turn it off, it stops. Thermal comfort is more direct because radiant heat warms people rather than air. In windy conditions, though, radiant effectiveness drops—a 3 kW patio heater at 10 mph wind feels like 1.5 kW indoors.
The trade-off is clear: storage heaters offer steady, whole-room heat with limited real-time control. Patio heaters offer instant, targeted heat with full control but limited coverage.
Which One Should You Choose? A Scenario Guide
Here's how I advise clients based on their specific situation (take it from someone who's mishandled this before):
Choose a Dimplex storage heater when:
- You're heating a permanent indoor space (home, office, apartment)
- You have access to off-peak electricity tariffs (Economy 7, TOU plans)
- The space needs consistent background heat throughout the day
- You can plan installation at least 2-3 weeks in advance
- Total cost of ownership matters more than upfront price
Choose a patio heater when:
- You need outdoor or semi-outdoor heat (patios, events, construction)
- Setup needs to happen in hours or days, not weeks
- The area is used temporarily (4-hour events, shift breaks)
- You need immediate, on-off heat control
- Portability and storage flexibility are priorities
I used to think a heater was a heater. Now I know better. The question isn't which one is better. It's which problem you're solving today.