RS Gas Toolkit

Rob's Gas Toolkit

UK residential — quick-access calcs + reference. Choose a tool.

Calculators

Site calcs covering UP/1B, UP/1A, G3 and BS 5440. All work offline.

Forms & records

Generate signed PDFs for handover. Every printed form is auto-saved to Saved Records.

Fuel

Meter

Meter type

Result

Volumes per IGEM/UP/1B Ed 4. Stabilisation and tightness periods auto-band by IV.

Installation volume

Imported from Purge calc — re-import after edits.

IV

—

Test setup

Test medium

Test pressure (mbar) Measured drop (mbar)

Procedure timers

Each stage beeps + vibrates when the time is up.

① Let-by test (1 min)

1:00

Pressure must hold steady — any rise indicates let-by.

② Stabilisation (1 min)

1:00

Allow temperature/pressure to settle before reading.

③ Tightness test (3 min — Note initial reading at start)

3:00

Note the pressure at start, then again when the alarm sounds — the difference is the measured drop entered above.

Result

UP/1B Ed 4 short test: 1-min stabilisation + 2-min test. MPPD shown is for typical small-bore domestic; larger/commercial installations require full UP/1 procedure with calculated MPPD.

Fuel

Mode

Meter

Meter type

① Initial reading

Run the appliance ≥ 10 min. All other gas appliances OFF. Note the last 3 digits before the timer.

② Timer

1:00

Duration (seconds)

TB 162: 60 s acceptable for metric. Use 120 s for older procedure.

③ Final reading

Tip: enter at the moment the timer alarm sounds. The diff is gas used during the timed window.

Imperial test dial

Dial size

Older imperial meters have a small "test dial" with a known volume per revolution. Time one full revolution.

Stopwatch (one full revolution)

0.0s

Time for one revolution (seconds)

Manual entry

Smallest dial size (m³ per revolution)

Common values: 0.01 (10 dm³), 0.001 (1 dm³), 0.0001 (0.1 dm³).

Revolutions

Time (seconds)

Result

Compare to the appliance data badge (gross input). Allow ≥10 min running for accuracy.

Material

Fuel

Inputs

Heat input (kW)

Pipe length (m)

Fittings (elbows + tees)

UP/1A: each elbow / tee adds ~0.5 m equivalent length.

Result

1 mbar total drop budget. Tabulated capacities are informative; verify with full UP/1A method on critical jobs.

Record

Report Ref No.

Inspection date

Next safety check due

Registered business details

Engineer name

Gas Safe reg. no.

Company Address

Postcode

Tel

Landlord / agent (if applicable)

Title

Name

Address

Postcode

Tel

Inspection / installation address

Search past records (postcode, surname, street)

Name & title (occupant) Address

Postcode

Tel

Faults & rectification

Details of any faults found Rectification work carried out Gas installation pipework

CO & smoke alarms

Approved audible CO alarms fitted & located correctly

CO alarms in date

Testing of CO alarms satisfactory

Smoke / heat alarms located & fitted correctly

Other comments / observations

Issued & received

Received by (delete as applicable)

Print name Customer signature (sign with finger)

Engineer signature

No one present at time of visit

Output

Customer email (optional)

Create PDF: builds the record, saves it to Saved Records, and opens your phone's Save-as-PDF dialog. After that you can email the customer (attach the saved PDF) or print.

Record

Serial / Ref No.

Inspection / commissioning date

Form for completion in accordance with the manufacturer's instructions, Water Supplies (Water Fittings) Regulations, Building Regulations Approved Doc G3, and the requirements of BS EN 806 / BS EN 12897.

Registered business details

Engineer name

Gas Safe / CPS reg. no.

Company Address

Postcode

Tel

Landlord / agent (if applicable)

Title

Name

Address

Postcode

Tel

Inspection / installation address

Name & title Address

Postcode

Tel

Hot water storage vessel — details

Make

Model

Location Type

Heat source Capacity (litres)

Operating details

Type of water supply

System operating pressure (bar)

Expansion vessel pressure (bar)

Expansion valve set pressure (bar)

Temperature relief valve set point (°C)

Combined T&P relief valve set point

Primary circuit max pressure & flow temp (indirect vessels)

Discharge pipework D1 (relief valve to tundish)

Nominal D1 size

Length

Number of discharges

Manifold size (if >1)

Tundish in same location as the cylinder?

Tundish visible?

Automatic discharge-detection device fitted?

Discharge pipework D2 (tundish to point of termination)

Nominal D2 size

Material

Has a minimum 300 mm vertical from tundish?

Continuous fall to termination?

Method of termination Method of termination satisfactory?

Tip: Use the D2 Discharge calculator on the home screen to size D2 length / bends against G3 worked equivalents before signing off.

Installation & commissioning

Maker's warning label fitted?

Inlet pressure & flow rate Fully commissioned?

Installed by a self-certified (CPS) member operative?

Notification given to Local Authority Building Control?

Observations & recommendations

Observations (if any) Recommendations (if any)

Company representative

Print name

Date

Signature (typed)

Output

Customer email (optional)

Create PDF: builds the record, saves it to Saved Records, and opens your phone's Save-as-PDF dialog. Then email or print.

Record

Ref No.

Commissioning date

Boiler installation commissioning record. Required by manufacturers for warranty registration. Cross-reference with the appliance Benchmark logbook.

Registered business

Engineer

Gas Safe reg. no.

Company Address

Postcode

Tel

Customer / property

Search past records

Customer name Property address

Postcode

Tel

Landlord / agent (if applicable)

Name Address

Boiler details

Make

Model

Serial no.

GC No.

Fuel

System type

Water treatment

System flushed (BS 7593)

Cleanser used

Cleanser brand

Cleanser dose

Inhibitor added

Inhibitor brand

Inhibitor dose

Magnetic filter fitted

Filter brand

Pressures & temperatures

Expansion vessel charge (bar)

System pressure cold (bar)

CH flow temp (°C)

DHW flow temp (°C)

Inlet gas pressure (mbar)

Burner pressure (mbar)

Combustion analysis

Record the analyser readings at high fire (full rate). Initial = first read; Final = post-adjustment.

Initial reading

CO (ppm)

CO₂ (%)

CO/CO₂ ratio

Final reading

CO (ppm)

CO₂ (%)

CO/CO₂ ratio

Customer hand-over

Controls explained to user

User manuals handed over

Manufacturer warranty registered

Benchmark logbook completed

Notes / observations

Sign-off

Customer print name Customer signature

Engineer signature

Output

Customer email (optional)

Create PDF: builds the commissioning record, saves it to Saved Records, and opens Save-as-PDF. The customer needs this for their warranty.

Warning Notice

Ref No.

Issue date

Issue this notice when an appliance has been classified At Risk, Immediately Dangerous, or Not to Current Standards. Hand a copy to the user; retain a copy on file.

Status

AR — capable of being made safe. ID — must not be used. NCS — installed before current regs but not unsafe.

Registered business

Engineer

Gas Safe reg. no.

Company Address

Postcode

Tel

Customer / property

Search past records

Customer name Property address

Postcode

Tel

Landlord / agent (if applicable)

Title

Name

Address

Postcode

Tel

Appliance

Make

Model

Location

Type

Flue type

Fault & risk

Fault description Why this poses a risk

Action taken

Warning label affixed to appliance

Appliance disconnected

Gas supply capped / capped off at meter

Isolation valve closed (gas turned off to appliance)

Advice given to user

Receipt

Customer print name Customer signature

Engineer signature

Output

Customer email (optional)

Create PDF: builds the notice, saves it to Saved Records, and opens Save-as-PDF. Then email or print. Hand a copy to the user before leaving site.

Saved Records

Every printed CP12, unvented commissioning, benchmark, or warning notice is saved here. Tap a record to re-open it; tap "Re-print" to regenerate the PDF.

Filter by type

Relief valve outlet (D1)

D2 run

Straight length (m) Number of bends (90°)

Building Regs Approved Doc G3 worked-equivalent. Tundish-onwards only — not the 500 mm vertical drop or first metre.

Result

Reference diagrams

Letter labels match the clearance values below — tap any letter to jump to it.

House corner — horizontal flue

Carport / balcony

Two terminals across a passage

Pitched roof — vertical flue

Diagrams are schematic — not to scale. BS 5440 Pt 1, fanned-flue gas appliances ≤ 70 kW net. Always confirm with appliance MI.

Search clearances

Appliance type

Heat input

Net heat input (kW)

Result

Search

Matches across fault codes AND boiler models. Tap a model to open its full service hub (tech data, gas valve, fault codes, parts, wiring).

Filter

Brand Model (optional) Search code or symptom

Pick a brand + model to get a button on every fault that opens the manual PDF jumped to the relevant section.

Boilers — browse by model

Pick a brand and model to open its service hub (Service Info, Service Mode, Gas Valve / Fan, Fault Codes, Wiring…) or jump straight to the manufacturer's manual.

Tap a model name to open its service hub. Tap 📄 PDF to open the manual directly.

My details

Saved on this device only. Used by the CP12 "Use my details" button.

Your name Gas Safe reg. no. Company name Company address Company phone

Backup & restore

Export every saved record + your profile as a JSON file. Useful before you change phone, or as a periodic backup.

Import JSON