About the template
What this boiler invoice template covers and why customers pay fast
Boiler invoices stall when 'new boiler installed' is the only line. The template below shows the boiler brand and model fitted, the flue, the smart controls, the powerflush completed, and the Gas Safe certificate reference.
Gas Safe certificate number on the invoice is critical for the customer's insurance, future property sale, and warranty registration.
What to include
Every boiler installers invoice should have these lines
Use it as a checklist when you build your invoice from scratch, or pull the QuoteGenio template that already has them.
Sample
A real boiler installers invoice laid out properly
A worked example so you can see what a clean, structured version looks like before you write your own.
Invoice sample
Worcester Bosch 30kW combi swap completed
Bill to
Diane Wallace
+1 (555) 408 7126
57 Maple Crescent, Austin
From
Wallace Heating
+1 (555) 220 1184
9 Yard Lane, Cedar Park
Worcester Bosch Greenstar 30Ri fitted (30kW combi, 10-yr warranty)
Horizontal flue fitted (1m, standard pipe)
Nest smart thermostat fitted (3rd gen)
Powerflush completed (existing system)
Adey MagnaClean Pro2 magnetic filter fitted
Old boiler removed and disposed
Site labour (Gas Safe engineer, 1 day)
Gas Safe certificate issued (#GS-2026-04812)
Less: 50% deposit paid on order
Sample data converted from USD to ZAR at indicative rates. QuoteGenio supports 40+ currencies and your branded business details, banking, and logo flow through automatically.
Use this template
Build your own boiler installers invoice in 2 minutes
Your business name, logo, and banking details fill in automatically. Send the branded PDF via WhatsApp in one tap.
Avoid these
Common mistakes on boiler installers invoices
The patterns that quietly lose jobs, get queried at payment time, or leave money on the table.
Mistake: Gas Safe certificate number not on invoice
Better: Customer's insurance, sale records, and warranty registration all reference this number.
Mistake: Boiler warranty registration not confirmed
Better: Register the boiler with the manufacturer on the customer's behalf. State on invoice.
Mistake: Flush method silent
Better: Powerflush vs chemical flush and manufacturers require specific methods for warranty. State on invoice.
Mistake: Smart controls bundled into labour
Better: Smart controls are real material. Itemise so customer sees the upgrade.
Mistake: Old boiler removal not separated
Better: Removing and disposing of the old unit is real labour. Quote separately.
Mistake: No banking reference
Better: Banking reference must be invoice number for same-day matching.
FAQ
Boiler Installers invoice template questions
Everything boiler installers ask before they switch to a structured invoice.
Net 7 on balance. 30-50% deposit on order is industry standard.
Required by insurance, property sales, and manufacturer warranty registration.
Yes. PDF via WhatsApp with certificate attached. Most homeowners pay within a week.
Worcester Bosch 10-year, Vaillant 10-year, Ideal 7-10 year. State per brand fitted.
Always. Register the boiler on the customer's behalf and confirm on the invoice.
Standard 12-month service typically included. State the next-service date on the invoice.
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