How to Read Your Smart Meter UK
Complete guide to reading SMETS1 and SMETS2 smart meters, using your In-Home Display (IHD), and understanding your energy usage in real-time.
📱 Smart Meters Send Readings Automatically
Good news: you don't need to manually read your smart meter - it sends readings to your supplier automatically every 30 minutes. However, learning to read your meter and IHD helps you monitor usage, verify bills, and catch issues early. This guide covers all meter types and button configurations.
30 mins
Automatic Reading Frequency
Real-time
IHD Energy Usage Display
30 secs
Time to Read Meter
Quick Start: Do You Need to Read Your Meter?
Short answer: Usually no! Smart meters automatically send readings to your supplier, eliminating manual meter reads.
When You DON'T Need to Read Meter:
- SMETS2 meter working properly: Sends readings automatically every 30 minutes via national DCC network
- SMETS1 meter still "smart": If meter stayed smart after switching suppliers, sends readings automatically
- Bills show actual readings: Check bill - if says "actual" not "estimated", meter is communicating fine
- IHD showing current usage: If In-Home Display updates in real-time, meter connection working
When You DO Need to Read Meter:
- SMETS1 meter "gone dumb": Lost smart functions after switching suppliers - need manual reads like old meter
- Communication issues: Meter not sending readings to supplier (bills show "estimated")
- Switching supplier: Take final reading on switch date for accurate final bill
- Billing dispute: Verify your actual usage vs supplier's records
- Monitor specific usage: Want to check usage before/after changes (e.g., new appliance, insulation)
- Moving home: Final reading needed for closing account
Pro tip: Even if meter sends readings automatically, learn to read it. Useful for checking your IHD matches meter, verifying bills, and understanding your consumption patterns. Takes 30 seconds once you know how.
How to Read Your Smart Electricity Meter
Electric smart meters have different button configurations depending on manufacturer. Find your meter type below:
Type 1: Green 'A' and White 'B' Buttons (Most Common)
Identifying Features:
Green A button to right of screen, white B button below it. Common brands: Landis+Gyr, Secure.
How to Read:
- Press white B button: Screen lights up
- Wait for "Meter Boost": Screen cycles through options
- Press A to select "No": Decline meter boost
- See reading: Number followed by "KWH" appears
- Write down reading: Note numbers from left to right (e.g., 00256.78 = reading is 256)
- Ignore: Leading zeros and anything after decimal point
Example: Display shows 00256.78 KWH → Your reading is 256
Type 2: Green 'A' and Grey 'B' Buttons
Identifying Features:
Green A button and grey B button to right of screen. Aclara brand common.
How to Read:
- Look at screen: No button press needed - always displays reading
- Find "KWH" label: Number next to KWH is your reading
- Write down reading: Numbers from left to right
- Ignore: Leading zeros and decimal points
Example: Display shows 01234 KWH → Your reading is 1234
Type 3: Two White Buttons to Right
Identifying Features:
Two white buttons on right side, screen auto-cycles between displays. Kaifa brand common.
How to Read:
- Wait for auto-cycle: Screen automatically changes every few seconds
- Watch for KWH screen: Display showing numbers followed by KWH
- Write down reading: Note numbers when KWH screen appears
- Troubleshooting: If screen not cycling, contact supplier - meter may need attention
Example: Screen cycles to 5432 KWH → Your reading is 5432
Type 4: Buttons Including "Reconnect" or "Display"
Identifying Features:
Two buttons on right, one labeled "Reconnect", "Display", or "Display Select". Common on prepayment meters.
How to Read:
- Press "Display" button: Activates screen
- Press "Display" again: Cycles through screens
- Find KWH screen: Keep pressing until you see numbers followed by KWH
- Write down reading: Numbers shown with KWH label
Prepayment meters: May show credit remaining on different screen - don't confuse with KWH reading!
Type 5: Orange Button (Single Button)
Identifying Features:
Single orange button on front of meter.
How to Read:
- Press orange button: Wakes screen
- See reading: Number displays immediately
- Write down reading: All digits from left to right
- Ignore: Leading zeros and decimal points
Economy 7 / Economy 10 meters: If you have time-of-use tariff, meter shows multiple readings - one for day rate, one for night rate. Press buttons repeatedly to cycle through all readings. You need both! Typically labeled "Rate 1" (day) and "Rate 2" (night), or "Normal" and "Low".
How to Read Your Smart Gas Meter
Gas smart meters simpler than electric - fewer button variations. Find your type:
Type 1: Numeric Keypad (Most Common)
Identifying Features:
Keypad with numbers 0-9. Should have "G4" and "GWi" printed on meter casing.
How to Read:
- Press number 9: Activates screen
- See "Volume" label: Word "Volume" appears on screen
- Reading displays: Number in cubic meters (m³) appears
- Write down reading: Could be 5 digits (e.g., 01234) or 8 digits (e.g., 00001234)
- Ignore: Leading zeros and anything after decimal point
Example: Display shows 00123.456 m³ → Your reading is 123
Type 2: A and B Buttons
Identifying Features:
Simple A and B buttons to left and right of screen. Common brands: Landis+Gyr, Secure.
How to Read:
- Press button A: Wakes screen
- Keep pressing A: Cycles through different screens
- Find "Meter Index": Screen showing "Meter Index" label
- Wait few seconds: Reading in m³ appears after "Meter Index"
- Write down reading: Number shown in cubic meters
Example: After "Meter Index", see 456 → Your reading is 456
Type 3: Left and Right Buttons
Identifying Features:
One button on left side, one on right side of screen.
How to Read:
- Press right button: Wakes meter screen
- See reading: Number in m³ displays
- Write down reading: All digits from left to right
- Ignore: Leading zeros and decimal points
⚠️ Gas Meter Units: m³ Not kWh
Gas meters display reading in cubic meters (m³), NOT kilowatt-hours (kWh). Your supplier converts m³ to kWh on your bill using conversion factor (typically 11.1-11.4 depending on gas calorific value). If submitting reading online, enter m³ value exactly as shown - supplier handles conversion.
Using Your In-Home Display (IHD)
IHD is portable screen showing real-time energy usage and costs. Two main versions: IHD6 (current) and IHD3 (older).
IHD6 (Current Model) Features
Main Display Icons
- Connection indicator: Signal strength bars - keep IHD within 15m of smart meter for best signal (3-4 bars ideal)
- Energy use dial: Visual indicator rising through day - flash ⚡ symbol for electricity, flame 🔥 for gas
- Traffic light colors: Green = low usage, Orange = medium usage, Red = high usage (helps identify energy-hungry activities)
- Cost display: Shows £ and pence of energy used for selected period (includes VAT)
- Wi-Fi icon: Indicates Wi-Fi connection status (some models connect to home Wi-Fi for app integration)
- Battery icon: Charge level - 4-hour battery life, plug in regularly to recharge
- Time display: Current time in 24-hour format
IHD6 Navigation Buttons
- Home button (house icon): Returns to main screen showing today's usage so far
- Now button: Real-time usage - see exactly what you're using RIGHT NOW in kW and £/hour (brilliant for testing appliances)
- Fuel button (flash/flame icons): Switch between electricity only, gas only, or combined total
- Calendar button: View historical usage - daily, weekly, monthly, yearly breakdowns
- Menu button: Access settings, meter readings, energy budgets, account info, tariff details
IHD3 (Older Model) Differences
- No Wi-Fi: IHD3 doesn't connect to Wi-Fi - purely meter communication
- Simpler interface: Fewer features but same core functionality
- Traffic lights: Same green/amber/red usage indicators
- Buttons: Home, Now, Utility (instead of Fuel), Calendar - similar navigation
- Still works: Perfectly functional - doesn't need upgrading unless you want Wi-Fi features
Using "Now" feature effectively: Press "Now" button, then turn appliance on/off to see immediate impact. Example: kettle boiling adds 2-3kW (60-80p/hour), washing machine 0.5-2kW depending on cycle, TV 0.1kW (2p/hour). Great for identifying energy vampires!
SMETS1 vs SMETS2: Understanding Your Meter Generation
Two generations of smart meters in UK - affects functionality and reliability.
| Feature |
SMETS1 (First-Generation) |
SMETS2 (Second-Generation) |
| Installation Period |
2011-2018 (early rollout) |
2018-present (current standard) |
| Communication Network |
Regional/supplier-specific mobile networks |
National DCC network (unified system) |
| Switching Suppliers |
Often goes "dumb" - loses smart functions |
Always stays smart - works with all suppliers |
| Automatic Readings |
Yes (if staying with same supplier or enrolled in DCC) |
Yes (guaranteed with all suppliers) |
| IHD Functionality |
May stop working after switch |
Continues working after switch |
| Remote Upgrades |
Limited or none - many enrolled in DCC program for upgrade |
Full remote firmware updates supported |
| Cybersecurity |
Basic security standards |
Enhanced security with regular updates |
| Future-Proofing |
Limited - being upgraded to DCC where possible |
Designed for next-gen energy systems (solar, EV, batteries) |
| What to Do |
Check if enrolled in DCC upgrade program, or request SMETS2 replacement |
Nothing - you have best available |
← Scroll table horizontally on mobile →
How to Tell Which You Have
- Installation date: Installed before 2018 = likely SMETS1, after 2018 = likely SMETS2
- Switching test: If switched suppliers and meter went dumb = SMETS1, stayed smart = SMETS2
- Ask supplier: Contact supplier and ask "Do I have SMETS1 or SMETS2?" - they have records
- Meter label: Some meters have "SMETS2" printed on casing
⚠️ SMETS1 "Gone Dumb" - What to Do
Problem: Switched suppliers and SMETS1 meter lost smart functions - now need manual readings like old meter. Solution 1: Wait for DCC enrollment - government program upgrading SMETS1 meters remotely to work with DCC network (automatic, free, happening gradually 2024-2026). Solution 2: Request SMETS2 replacement from supplier (free, but scheduling installation takes time). Temporary: Submit manual meter readings monthly to avoid estimated bills.
❌ Common Meter Reading Mistakes to Avoid
1. Including Leading Zeros
Wrong: Display shows 00256, submit reading as 00256
Right: Display shows 00256, submit reading as 256
Leading zeros don't count - ignore them!
2. Including Decimal Points
Wrong: Display shows 1234.567, submit 1234.567
Right: Display shows 1234.567, submit 1234
Everything after decimal point is fractional kWh - ignore it.
3. Confusing Gas m³ with kWh
Wrong: Gas meter shows 123 m³, manually convert to kWh
Right: Gas meter shows 123 m³, submit 123 in m³
Submit m³ value exactly as shown - supplier converts to kWh on bill.
4. Reading Wrong Screen (Economy 7)
Wrong: Economy 7 meter, only submit day rate reading
Right: Economy 7 meter, submit both Rate 1 (day) AND Rate 2 (night)
Need both readings for accurate billing - press buttons to see all rates.
5. Confusing Prepayment Credit with Reading
Wrong: Prepayment meter shows "Credit: £15.50", submit this
Right: Keep pressing buttons until you find screen with "KWH", submit that number
Credit remaining is NOT your meter reading - different screens!
6. Reading IHD Instead of Meter
Wrong: Take reading from IHD screen and submit to supplier
Right: Go to actual meter on wall, read directly from meter screen
IHD shows estimates and may have slight delays - always use meter itself for official readings.
Smart Meter Troubleshooting
Problem 1: IHD Not Showing Usage
Symptoms: IHD screen blank, shows "No connection", or stuck on old data
Solutions:
- Check distance: IHD must be within 15m of smart meter - try moving closer
- Check battery: Plug IHD into power, let charge for 30 mins, try again
- Reboot IHD: Hold power button 10 seconds to turn off, wait 30 seconds, turn back on
- Check meter screen: If meter screen working but IHD not, may need re-pairing - contact supplier
- Obstacles: Thick walls, metal objects between meter and IHD can block signal - reposition
Problem 2: Meter Screen Blank or Not Responding
Symptoms: No display when pressing buttons, completely blank screen
Solutions:
- Check power: Meter should be powered by mains - if electric and gas both dead, check main fuse
- Press all buttons: Try each button for 5+ seconds - some meters take time to wake
- Check connections: Loose wire at meter could cause issues - don't touch yourself, call supplier
- Supplier contact: If screen permanently dead, meter may be faulty - supplier must replace free
Problem 3: Bills Show "Estimated" Not "Actual"
Symptoms: Bill says "Estimated reading" despite having smart meter
Solutions:
- Check SMETS1 status: If switched suppliers, SMETS1 may have gone dumb - submit manual reading
- Communication failure: Contact supplier - meter may need reconfiguring or replacement
- Submit manual reading: While waiting for fix, submit monthly readings online to avoid estimates
- Check account settings: Some suppliers need you to opt-in to half-hourly readings - check online account
Problem 4: Reading Doesn't Match IHD
Symptoms: Meter shows 5000 kWh, IHD shows 5100 kWh (or vice versa)
Solutions:
- Normal delay: IHD can be up to 30 mins behind meter - wait and recheck
- Different periods: IHD may show "today so far" while meter shows total ever - check you're comparing like-for-like
- IHD estimate: IHD sometimes estimates - always trust meter reading over IHD for official purposes
- Large discrepancy: If difference is 100+ kWh, contact supplier - may indicate meter fault
Problem 5: Meter Reading Going Down
Symptoms: Reading lower than last month (e.g., was 5000, now shows 4500)
Solutions:
- Check decimal point: May have included decimal last time but not this time (5000.0 vs 500.0)
- Wrong rate: Economy 7 - may be comparing day rate to night rate (different numbers)
- Meter reset: Rare but some meters reset after 99999 - contact supplier if suspected
- Export meter: If you have solar panels, check you're reading import meter not export meter (separate)
💡 Smart Meter Best Practices
For Automatic Readings (SMETS2 or Working SMETS1)
- Check bills monthly: Verify bills show "Actual" not "Estimated" - confirms meter communicating
- Use IHD daily: Check "Now" screen each morning - helps spot unusual usage or faults
- Take quarterly manual reading: Even with auto-readings, take manual reading every 3 months as backup
- Photo evidence: Take phone photo of meter screen when reading - useful for disputes
- Keep IHD charged: Plug in overnight regularly - 4-hour battery drains quickly if forgotten
For Manual Readings (Dumb SMETS1)
- Monthly schedule: Same day each month (e.g., 1st) for consistent pattern
- Submit immediately: Read meter, submit to supplier same day - don't delay
- Set reminder: Phone alarm or calendar reminder for monthly reading date
- Both fuels: Read electric AND gas on same day - easier to remember
- Record readings: Keep spreadsheet or notebook - helps spot errors and track usage
Using IHD to Save Energy
- "Now" testing: Turn appliances on/off while watching "Now" screen - identify energy hogs
- Baseline check: At night with everything off, check "Now" - should be under 0.1kW (standby power only)
- Daily budget: Set budget on IHD (Menu > Energy Budget) - alerts when exceeded
- Weekly review: Check weekly usage every Sunday - spot trends and adjust behavior
- Compare periods: Use Calendar view to compare this week vs last week, this month vs last month
📊 Smart Meter Reading Summary
Basic principle: Smart meters send readings automatically every 30 minutes - manual reading rarely needed. However, knowing how helps verify bills, troubleshoot issues, and monitor usage.
Electric meters: Multiple button configurations - most common has green A and white B buttons. Press B to wake, press A to cycle, find number followed by "KWH". Ignore leading zeros and decimals.
Gas meters: Simpler than electric - usually press 9 on keypad or press A button repeatedly. Reading shown in cubic meters (m³). Ignore leading zeros and decimals.
In-Home Display (IHD): Portable screen showing real-time usage and costs. Most useful feature is "Now" button - see exact current usage for appliance testing. Keep within 15m of meter, charge regularly.
SMETS1 vs SMETS2: SMETS1 (2011-2018) often loses smart functions after switching suppliers. SMETS2 (2018+) stays smart with all suppliers. If stuck with dumb SMETS1, request SMETS2 replacement or wait for DCC enrollment.
Common mistakes: Including leading zeros (wrong: 00256, right: 256), including decimals (wrong: 123.45, right: 123), reading IHD instead of meter (always read meter itself for official readings).
Troubleshooting: IHD not working = check distance (15m max), charge, and reboot. Bills showing estimated = meter not communicating, submit manual readings. Reading going down = check you're not including/excluding decimals inconsistently.
Best practice: Even with auto-readings, check bills monthly to confirm "Actual" not "Estimated". Use IHD daily for monitoring. Take quarterly manual reading as backup. Photo meter screen for disputes.
