News, seasons and straight talk.
The Manifold blog covers gas safety, running a gas engineering business, and the odd bit of Manifold news. For the evergreen how-tos, see the guides.
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IGEM/UP/1B Edition 4: what changes on 1 October 2026
Edition 3 is withdrawn on 30 September. The permissible drop bands for natural gas, LPG and LPG/Air, what changed in the procedure, and two worked tests, each figure read from Gas Safe Register and IGEM.
Main boiler data plate: where the serial number and GC number are
Where Main Heating puts the data badge and the serial label on each range, the GC numbers read out of its own installation manuals, and the honest answer on dating a Main boiler from the serial.
Ferroli data plate: where the serial number and GC number are
Ferroli prints the GC number on the manual cover and says nothing about where the plate sits. Here is every published GC number, the serial formats Ferroli does publish, and the routes to an age.
Potterton data plate: where the serial number and GC number are
Where Potterton puts the data badge and the user label on each range, the GC numbers from its own installation manuals, and the honest answer on dating one from the serial.
Viessmann data plate: where the serial number and GC number are
Viessmann puts the serial on top of the boiler on some ranges and behind the front panel on others. Here is each range from Viessmann's own pages, the GC numbers by type, and the guarantee check.
Alpha data plate: where the serial number and GC number are
One label carries the model, the serial and the GC number. Here is where Alpha puts it on each range, the GC numbers themselves, and the honest position on dating an Alpha from its serial.
Vokera data plate: where the serial number and GC number are
One data badge carries the model, the GC number, the serial and the build date. Here are the GC numbers by output, read from Vokera's own manuals and literature page, and the honest answer on dating a Vokera from its serial.
Baxi system filters and water treatment: the four steps behind the warranty
Baxi presents the system filter as a Building Regulations duty rather than an upsell. Here is the four step rule in its own words, and the one range where dropping the filter costs eight years of cover.
Ideal boiler water treatment: what the Logic and Vogue manuals actually say
The Logic manuals forbid filling with artificially softened water. The Vogue Max manuals permit it. Here is what Ideal actually publishes on water treatment, the filter, and the conditions that quietly void both warranties.
Vaillant system water quality: treatment, filters and the guarantee
Vaillant publishes hard numbers for heating water quality and a filter condition that carries the longest guarantee. Here is what the manual and the guarantee terms actually say, and where the paperwork has fallen behind.
Worcester Greenstar system filters and water treatment: what the guarantee asks for
Worcester turns system water quality into guarantee conditions: a BS7593 flush, an inhibitor with a two yearly strength check, and a filter to reach twelve years. Here is what the terms actually say.
Glow-worm controls and Boiler Plus: which current control does what
Glow-worm's how to comply pages still lead with MiGo, Climapro2 and Climapro1. All three are now discontinued. Here is what the range you can actually buy does.
Baxi controls and Boiler Plus: what Baxi actually claims
Two Baxi products carry a Boiler Plus claim and both are conditional. Here is what the current pages say, and the wiring detail that decides which unit is in charge.
Ideal controls and Boiler Plus: which route each control takes
Ideal names three of its own products as Boiler Plus compliant, and they take three different routes. Here is which control does what, and the two traps in the regulation itself.
Vaillant controls and Boiler Plus: which control meets which route
Boiler Plus gives a combi replacement four routes to compliance. Vaillant's own controls cover three of them. Here is which control does what, and the pairing rules that catch people out.
Worcester Greenstar controls: what Boiler Plus asks for
A gas combi replacement in England needs one of four measures. Here is which Worcester control covers which, and what changes on a system or regular boiler.
Glow-worm combi, system or regular: which fits which home
Glow-worm groups its boilers three ways by where the hot water comes from. Here is which models sit in each group, and what to measure before you quote.
Baxi combi, system or heat only: which fits which home
Baxi groups its boilers three ways by where the hot water comes from. Here is which models sit in each group, and what settles it on site.
Ideal combi, system or heat only: which fits which home
Ideal groups its gas boilers three ways by where the hot water comes from. Here is which models sit in each group, and what settles the choice on site.
Vaillant combi, system or open vent: which fits which home
Vaillant groups its gas boilers three ways by where the hot water comes from. Here is which models sit in each group, and what decides the choice on site.
Worcester Greenstar combi, system or regular: which fits which home
Worcester groups Greenstar three ways by where the hot water comes from. Here is which models sit in each group, and what actually decides the choice on site.
Glow-worm servicing: what keeps the guarantee valid
Glow-worm makes the yearly service a condition of the guarantee, with the Benchmark entry alongside it. Here is what that means on the tools.
Baxi servicing: what keeps the warranty valid
Baxi hangs the whole warranty on three conditions, and one of them comes back every year. Here is what that means on the tools.
Ideal servicing: what keeps the warranty valid
Ideal makes the yearly service a condition and says the warranty lapses without it. Here is what that means on the tools.
Vaillant servicing: what keeps the guarantee valid
Vaillant makes the yearly service and the Benchmark entry conditions of the guarantee. Here is what that means on the tools.
Ideal boiler data plate: where the serial and GC number are
Ideal labels the same boiler twice. Here is where the data plate and the barcoded serial sticker sit, and which fields belong on the record.
Best card readers for gas engineers: the 2026 fees compared
Nine ways to take a card on the doorstep, every fee checked against the provider's own pricing page, and the arithmetic worked at £1,500, £4,000 and £10,000 a month so you can see what a rate really costs you.
Worcester Greenstar servicing: what keeps the guarantee valid
Worcester makes the yearly service a condition of the guarantee. Here is what that means on the tools, and what to keep on record.
Glow-worm data plate: where the serial number and GC number are
One plate, usually underneath. Here is where Glow-worm puts the serial number and the GC number on each range, what the serial digits decode to, and the GC numbers themselves.
Baxi data plate: serial number, GC number and registration
Where Baxi puts the serial on each range, the GC numbers read out of its own manuals, and the 30 day registration rule that decides whether the guarantee runs ten years or twelve months.
Vaillant data plate: where the serial number and GC number are
Two plates, two places, and the current ecoTEC plus moved both. Here is each range from Vaillant's manuals, the serial decode that dates the boiler, and the GC numbers.
Where is the GC number and data plate on a Worcester Bosch boiler?
Per-range badge locations, a GC number lookup for the current Greenstar models, and Worcester's own rule for reading the manufacture date out of the serial.
Glow-worm Energy and Betacom4: which suits which home
The Energy is the range you fit today; the Betacom4 is the one you now service. Here is the short version, and what to read off the data plate before you quote.
Baxi 800 vs 600 vs Assure: which suits which home
Baxi's three domestic tiers suit three different jobs. Here is the short version, and what to read off the data plate before you quote.
Ideal Logic vs Logic Max vs Vogue Max: outputs, flow rates and warranty
The two Logic tiers share a spec sheet. The Vogue Max does not. Here are the verified outputs, flow rates, gas rates and GC numbers for all nine current Ideal combis, plus the warranty conditions in full.
Vaillant ecoFit pure vs ecoTEC plus vs exclusive: which suits which home
Outputs, flow rates at a stated temperature rise, GC numbers, dimensions and guarantee terms for all three Vaillant tiers, plus which model suits which home.
Worcester Greenstar 2000 vs 4000 vs 8000: which suits which home
The three main Greenstar tiers suit three different homes. Here is the short version, and what to check on the data plate before you quote.
Are gas boilers being banned? What the 2026 rules actually say
The short version: no ban on your boiler. Here's what is actually changing, what got quietly dropped, and what to tell customers who've read the headlines.
EPC C by 2030: what the MEES changes mean for landlords
The energy rules for rentals are firming up: EPC C by 2030 and a £10,000 cap. Here's the confirmed picture, minus the noise.
The Clean Heat Market Mechanism, explained for installers
You may have seen 'boiler tax' on an invoice. Here's what the Clean Heat Market Mechanism actually is, and who really pays.
Heat pumps and the gas engineer: threat, opportunity, or hype?
The heat pump debate runs hot. Here's a level-headed look at what it actually means for a gas engineer's business.
Carbon monoxide alarm rules for landlords: the law, the signs, and what to tell tenants
The carbon monoxide alarm rules aren't the same across the UK. Here's what's required where, and the signs everyone should know.
Making Tax Digital: what it means for self-employed gas engineers
Making Tax Digital has started for higher-earning sole traders, and the first quarterly deadline has now passed. What it meant, how the run-up went, and how to stay on top of the next one.
The Renters' Rights Act and gas safety: what changes, and what the penalties are now
The big rental shake-up is here. Your gas safety duty is unchanged, and so is its penalty. What changed is how visible your compliance record is.
Awaab's Law and private landlords: what's confirmed, what's coming
Awaab's Law is live for social housing. Here's what it means, and where private landlords actually stand right now.
Why January is the worst month for boiler breakdowns
The data backs up what every engineer already knows: January is peak breakdown season. Here's why, and how to beat it.
Gas engineer day rates in 2026: what to charge
What are gas engineers actually charging in 2026? The published numbers, the regional spread, and how to price your own day.
Gas Safe registration and ACS costs in 2026
The price of staying qualified, in plain numbers: this year's Gas Safe registration fee and what an ACS reassessment actually costs.
Get your rental properties winter-ready: a landlord's checklist
A short autumn checklist so your rentals go into winter safe, warm and compliant, not scrambling in December.
Frozen condensate pipe: the winter call-out you can prevent
The first hard frost brings a wave of no-heat call-outs, and a lot of them are the same simple, preventable fault.
Clocks go back: a good prompt to test your heating and alarms
A ready-made twice-a-year reminder to check the heating before you need it, and test the alarms that keep you safe.
Gas safety myths landlords still believe
Some gas safety myths are surprisingly sticky, and a few can land a landlord in real trouble. Here are the common ones, put straight.
A quarterly gas compliance checklist for letting agents
Across a portfolio, gas compliance is a rhythm, not a one-off. A simple quarterly routine that keeps every property covered.
New landlord? Your first 90 days of gas compliance
Becoming a landlord comes with a gas safety duty that starts before your first tenant moves in. A 90-day plan for getting it right from day one.
Paper vs app: an honest look at going digital for CP12s
A digital CP12 is just as valid as a paper one. The real question is whether going digital is worth it for how you work.
Buying a rental with gas appliances: what to check before you complete
A homebuyer survey won't tell you if the boiler's on its last legs. What to look at before you commit, especially if you're going to let it.
No heat at Christmas: how to prepare, and how to cope with the rush
The week between Christmas and New Year is peak no-heat season. A bit of prep saves everyone the worst of it.
Why we built Manifold offline-first
The loft, the basement, the cupboard under the stairs: half a gas engineer's day has no signal. Here's why we built for that first.
Product notes: a portal where landlords and agents see their gas certificates
A tidy, self-serve view of a customer's properties, appliances and certificates, so the resend-that-certificate calls stop.
From the tools: three analyser readings that made me stop and recheck
The analyser printout isn't just paperwork. Three readings from the tools that were worth stopping and rechecking for.
The £9,000 heat pump grant: what it means for gas engineers
From 21 July, off-grid oil and LPG homes can get £9,000 towards a heat pump. Here's the detail, and what it means for engineers.
Use the summer lull to get your gas business in order
The quietest weeks of the year are the ones to spend on the business, not just in it. Six things to do before autumn.
The landlord's mid-year gas-safety review: a 15-minute audit
Fifteen minutes now saves a scramble later. A simple mid-year audit of your rental properties' gas safety.
Manifold is now self-serve: start your free trial today
No more waiting for an invite. Start a free 30-day trial on your own jobs today, no card required.
Gas Safety Week 2026: a good prompt to get your renewals in order
The annual campaign is a useful nudge. Here's a five-minute way for landlords and engineers to use it.
Boiler service season is coming: get ahead of the autumn rush
The autumn rush is predictable, so it's beatable. How to spread the load before it hits.
The renewal rule that stops your CP12 dates drifting
A quirk of the rules, used well, keeps your renewal dates fixed year after year. Here's how it works.
Five gas safety mistakes landlords make (and the fix for each)
The slip-ups are common and every one is avoidable. Here are five, with the fix for each.