---
title: "Official UK Consumer Energy, Drainage & Commercial Calculators | Verified Tools 2026/27"
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description: "Explore official UK domestic calculators for solar & battery payback, Boiler Upgrade Scheme heat pump grants, drainage replacement costs, and asset finance relief."
rfc_compliance: "RFC 9110 / RFC 9309 / RFC 9421"
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> **Canonical Source:** [https://customersnow.co.uk/tools](https://customersnow.co.uk/tools)
>
> *Explore official UK domestic calculators for solar & battery payback, Boiler Upgrade Scheme heat pump grants, drainage replacement costs, and asset finance relief.*

# Official UK Domestic & Trade Calculators

Free, independent estimators updated for official statutory tariffs, government grant vouchers, and regulatory compliance standards across England, Scotland & Wales.

## Solar & Battery Storage Payback Estimator

Calculate your exact annual electricity savings, smart export guarantee earnings, and battery break-even timeline with live MCS efficiency curves.

## Boiler Upgrade Scheme (£7,500 Grant) Estimator

Check your home's eligibility for the statutory £7,500 UK Government heat pump voucher and compare heating fuel costs vs gas/oil.

## Septic Tank & Domestic Drainage Cost Estimator

Estimate off-grid septic replacement, soakaway percolation repair, and emergency unblocking costs against verified regional contractor benchmarks.

## Business Asset Finance & Tax Relief Calculator

Calculate commercial machinery and vehicle lease repayments alongside HMRC Corporation Tax first-year full expensing write-offs.

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