ESi at trade prices
Heating controls and thermostats
ESi Controls specialises in room thermostats, programmers and wireless controls that are quick to commission and easy for homeowners to use. It is a common choice when a boiler swap needs Boiler Plus compliance without a subscription-based smart system.
- Programmable room thermostats
- Wireless and OpenTherm models
- Cylinder and zone controls
12 products
Buying guides
Radiators Buying Guide: How to Choose Radiators for Any Room
Everything you need to compare radiator types, outputs and sizes before you buy — written for installers and homeowners.
HeatingBoilers Buying Guide: Combi, System and Regular Compared
How to choose between combi, system and regular boilers — output, hot water demand, fuel type and the parts every swap needs.
HeatingHow to Size a Radiator: BTU Calculations Made Simple
A step-by-step method for working out the BTU output a room needs, and how to turn that figure into a radiator height and width.
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GrantDelivery you can plan around
Free delivery over £100 ex VAT. Standard UK mainland delivery is £6.95 ex VAT.
Delivery information14-day standard returns
Eligible unused items may be returned within 14 days of delivery. Statutory rights are unaffected.
Returns policySecure checkout
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How we handle your dataTalk to our team
Mon–Fri 8am–5:30pm on 0330 043 4559 — specification checks, availability and project pricing.
Contact usStandard UK mainland delivery is £6.95 and free on orders over £100 ex VAT. Heavy or palletised items, the Highlands, Islands and Northern Ireland are quoted separately at checkout.