Check temporary kit loads before anyone plugs in.
For temporary heaters, dehumidifiers, fans and portable AC on UK supplies. Start with the job, check visible stop flags, then keep the load maths and handoff note with the site team.
Planning tool only. Not an electrical inspection, certificate or permission to run equipment. If labels, circuits, plugs or leads are unclear, stop and ask a competent person.
Above the planning warning point. Keep must-run load on, stagger the heater, capture lead/socket evidence and ask a competent person if the circuit is not confirmed.
If you only need the numbers, run the calculator here.
Enter the kit, socket or circuit rating and any extension-lead issues. The result gives total amps, warning margin and cable flags. For a messy job, start with the router and build the full handoff pack.
Heating, drying, cooling, extension lead concern or post-trip review.
Use equipment labels, socket groups, lead ratings and visible cable-route evidence.
Separate must-run equipment from loads that can cycle or wait.
Quick load check
Enter the socket or circuit rating and the kit that might run at the same time. Use this as a load check only — not as an electrical inspection.
Use the watts or amps printed on the equipment label. For portable AC, use input power — not BTU cooling output.
Use the right check for the job in front of you.
Temporary kit load check
Add heaters, dehumidifiers, fans and portable AC together, then see total amps, spare margin, daily kWh and cable red flags.
amps + cable risk Step-by-step planGuided setup assistant
Answer a few questions about the job, supply and kit, then get a staged load plan with stop points and a copyable handoff summary.
staged handoff Agentic front deskStart job router
Route a temporary heating, drying, cooling or trip job to the right evidence, circuit, schedule and supplier handoff step without hiding the load maths.
router + handoff Trip assistantBreaker trip triage assistant
Add same-time loads, trip symptoms and cable red flags to see whether the setup looks like overload, RCD trouble or a stop-and-ask condition.
trip + red flags Socket groupsCircuit mapping helper
Record a breaker/lamp test so unknown sockets stay out of the split plan until the circuit is actually confirmed.
confirmed circuits Mobile evidenceGuided evidence capture
Use phone-camera evidence slots for labels, plugs, leads, cable routes and breaker labels, then build a cautious handoff pack without inspection claims.
5 photo slots Run-time plannerLoad schedule / stagger planner
Separate must-run load from cycling or waiting loads so temporary heaters, drying kit, fans and AC do not all run together on one confirmed circuit.
stagger plan UK plug load3 kW / 13 A plug checker
Check how close a 3 kW heater is to a 13 amp plug/socket once voltage, other load, run time and extension-lead risk are counted.
13 A edge case Separate suppliesCircuit split planner
Place heaters, dryers and fans across known separate supplies so one socket or circuit is not carrying the whole temporary load.
separate circuits Leaks and damp roomsDrying kit load checker
Add dehumidifiers, air movers and background heaters before they run all day, then check amps, kWh and warning margin.
dehumidifiers + fans AC and fansPortable cooling load checker
Check portable AC input watts, cooling fans and existing same-socket equipment before adding more load to a hot room.
AC input watts Heater countElectric heater count planner
Work out how many equal-sized electric heaters fit on one or more selected supplies before the delivery turns up.
13 A / 16 A / 32 A Cable red flagsExtension lead risk checker
Check lead rating, coiled reels, adaptor chains, wet routes and traffic routes before high-load temporary equipment runs for hours.
reels + adaptors Supplier messageTemporary hire brief builder
Build a copyable hire-supplier note with site type, supply rating, equipment watts and the checks needed before delivery.
copyable brief kWh and tariffRunning cost estimator
Estimate amps while running, daily kWh and rough electricity cost from the equipment input watts, quantity, run time and tariff.
kWh/day + £ Label readerEquipment label reader
Upload a rating-label photo, extract visible volts, watts and amps, then confirm the numbers manually.
optional label readWhen temporary kit can overload the electrics
Use this when heaters, dryers or portable AC are needed today, but nobody is sure what the sockets can take or which items can run together.
Route the job, check the 3 kW edge case, then schedule heaters rather than overlapping everything.
Add dehumidifiers, air movers and background heat, then capture lead and route evidence.
Check portable AC, fans and existing must-run equipment before plugging in more cooling.
Start with the problem people actually see.
Heater keeps tripping the breaker
A plain-English first check for temporary heaters that trip a breaker, including load, circuit sharing and cable red flags.
3 kW 13 A check3 kW heater and 13 amp plug checker
Why a 3 kW heater is a tight fit on a UK 13 amp plug/socket and what to check before use.
Circuit mappingHow to check if sockets are on the same circuit
A simple breaker/lamp mapping process before spreading heaters, drying kit or portable AC across sockets.
Portable AC trip checkPortable AC trips the breaker
Check portable AC input watts, existing room load and trip symptoms before resetting a breaker again.
Drying kit load checkDehumidifier load check
Check the combined load from dehumidifiers, air movers and heaters used for damp rooms, leaks and drying work.
Extension lead red flagsExtension leads and temporary equipment
A plain-English checklist for extension leads, coiled reels and adaptor chains used with temporary heaters or drying kit.