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AI invoicing tools for heating engineers in the UK

Heating engineers invoice a mix of one-off repairs, installs, service plans and landlord work. Recurring service plans and agent accounts are where the money leaks if invoicing isn't automated.

Prices were re-checked on each provider's own page; the date is next to each one. Rules and figures from GOV.UK are linked where they're used.

Service plans

Bill service plans by direct debit or recurring invoice, and send reminders when the service is due. QuickBooks lists recurring invoices on Essentials and above; check what each app includes.

Landlord and agent accounts

For the annual landlord gas safety check (GOV.UK), invoice the agent with the property address and their order number, and attach the safety record.

Chasing business customers

Statutory interest on late business payments is 8% plus base rate (GOV.UK).

The options, with prices

Tool	Price and free plan	UK notes and source
Commusoft Field service software for heating, plumbing, electrical and other service firms, with job management, stock, service reminders and a customer portal.	No prices published on its plans page when checked; pricing is by quote. Free trial offered. No free plan; free trial offered.	UK company. Source, checked 15 October 2026
Powered Now UK trade app for quotes, invoices, job scheduling and compliance certificates, with an optional AI receptionist.	Business: £28 a month for one user (£280 a year). Professional: £32 per user a month (£320 a year). Premium: £40 per user a month (£400 a year). All excl. VAT. AI receptionist add-on from £29 a month. 14-day free trial, no card required. No free plan; 14-day free trial, no card required.	UK company, prices in pounds excl. VAT. Source, checked 15 October 2026
Xero Cloud accounting for invoices, bank feeds, VAT and payroll, with AI-assisted features.	Ignite: £18 a month. Grow: £39. Comprehensive: £55. Ultimate: £70 (all excl. VAT). When checked, the first 6 months were 90% off. Payroll £1.50 per person. No free plan; a free trial and introductory discounts are offered.	UK pricing in pounds; Making Tax Digital compatible. Source, checked 15 October 2026
QuickBooks Cloud accounting with invoicing, expenses and VAT, plus Intuit Intelligence AI features (some in beta).	Plans: Sole Trader Plus, Simple Start, Essentials, Plus and Advanced, each with a 30-day free trial. All include CIS calculation and submission; VAT submission isn't in Sole Trader Plus. Prices load dynamically on the UK pricing page, so check the current figure there. No free plan; 30-day free trial.	UK pricing in pounds. Source, checked 15 October 2026
Tide A business account app with invoicing, expense cards and accounting integrations.	Free plan with no plan fee. Smart: £12.49 a month. Pro: £27.49 a month. Max: £69.99 a month. Essential tools for getting started with no monthly plan fee (transaction limits vary by plan).	UK; Tide is authorised by the FCA as an e-money institution. Source, checked 15 October 2026

What to check before you choose

Recurring invoices or direct debit.
Attaching certificates to invoices.
Agent statements.
Making Tax Digital compatibility.

A prompt to start with

Paste this into ChatGPT or Claude, filling in the brackets:

Write a reminder to [letting agent] for invoice [number], £[amount], for the annual gas safety check at [address] on [date]. Say the safety record is attached and the payment terms are [x] days. Under 80 words, British English.

Free tools

Price a job with the quote and VAT calculator (20%, 5%, 0% and reverse charge), or work out your day rate. Comparing job management apps? Read Tradify vs Jobber.

Questions

Recurring invoices?

QuickBooks lists recurring invoices on Essentials, Plus and Advanced, and Commusoft lists recurring billing for service contracts. Check the plan. Checked 15 October 2026.

Free option?

Tide's business account has a free plan with invoicing. Checked 15 October 2026.

Are these prices in pounds?

Not all. Where a provider only publishes US dollar prices we show dollars, so check the price in pounds at checkout.

Do you get paid if I sign up?

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