---
product_id: 60963783
title: "Horstmann C21 Programmer, Multi"
brand: "horstmann"
price: "34 Lei"
currency: RON
in_stock: false
reviews_count: 8
url: https://www.desertcart.ro/products/60963783-horstmann-c21-programmer-multi
store_origin: RO
region: Romania
---

# 3 on/off settings 18-month battery backup Twin circuit control Horstmann C21 Programmer, Multi

**Brand:** horstmann
**Price:** 34 Lei
**Availability:** ❌ Out of Stock

## Summary

> 🔥 Control Your Comfort, Conquer Your Costs!

## Quick Answers

- **What is this?** Horstmann C21 Programmer, Multi by horstmann
- **How much does it cost?** 34 Lei with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/60963783-horstmann-c21-programmer-multi)

## Best For

- horstmann enthusiasts

## Why This Product

- Trusted horstmann brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **User-Friendly Design:** Plug-in plate and 3A contacts make installation a breeze, perfect for the modern home.
- • **Effortless Scheduling:** Seamlessly manage your heating and hot water with 3 customizable on/off settings per day.
- • **Reliable Power Backup:** Stay worry-free with an 18-month battery backup ensuring your settings are preserved.
- • **Smart Energy Management:** Optimize your energy usage and reduce costs while maintaining comfort.
- • **Instant Boost Functionality:** Need a quick heat-up? Enjoy a one-hour boost for hot water or instant advance for central heating.

## Overview

The Horstmann C21 Programmer is a sophisticated twin circuit electronic programmer designed for efficient management of heating and hot water systems. With three customizable on/off settings for both hot water and central heating, an instant boost feature, and an impressive 18-month battery backup, this device ensures you stay in control of your home environment effortlessly.

## Description

Product Description          Competitively priced electronic timeswitches and programmers with back lit display, automatic BST/GMT clock change and 6 pin wall plate. Controls most domestic gas or oil-fired central heating and hot water systems.             Box Contains          1 x Programmer1 x Instructions

## Features

- Twin circuit electronic programmer
- 3 on and off settings for HW and 3 on and off settings for CH per day
- One hour boost HW (only) and instant advance for CH (only)
- 18 months battery back up
- 3A contacts, plug-in plate

## Images

![Horstmann C21 Programmer, Multi - Image 1](https://m.media-amazon.com/images/I/61DGkR10IyL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Oh joy, oh joy
  

*by G***S on Reviewed in the United Kingdom 🇬🇧 on 31 December 2016*

Oh joy, oh joy. For years we all struggled with my elderly Mum's old programmer, that's 2 people with degrees, an engineer and myself.No one fully mastered it and I finally persuaded her that as I live 70 miles away and tend to be the one she phones to get jobs done that we needed a timer that was easy to set and adjust.Having had Horstmann previously and currently I immediately opted for this one.Was set in minutes after fitting and as the cold weather sets in has been equally easy to reset since.I'd be confident I could even talk her through resetting it over the phone as it's that easy.The hot water boost and advance is equally handy.Brilliant.

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Well made Control Switch
  

*by S***4 on Reviewed in the United Kingdom 🇬🇧 on 23 May 2014*

This worked perfectly, it was easy to set up. easy to read display. Bear in mind the switching timer is in 10 minute segments, which isnt a problem, it only makes things easier to change a time. One big advantage is you can set the HW and CH independently. you don't always want the heating on at the same time in the day as the hot water. I also have found the clock to be very accurate and has a date setting too. and the biggie is a 3amp switching which means I can use one of these controllers for a completely different purpose. lovely product.

### ⭐⭐⭐ 3.0 out of 5 stars







  
  
    Didn't work but I fixed it.
  

*by F***. on Reviewed in the United Kingdom 🇬🇧 on 3 March 2017*

Yes, it's OK but I nearly returned it to Amazon as it would not fit onto its backplate.  However, I persevered and, with my innate skill, fixed it and it is now working fine.  True, the price was reduced as what I take to be an item that was 'used', although it looked perfectly untouched when I received it.Anyway, Amazon's returns policy is very good; no quibbling.

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.ro/products/60963783-horstmann-c21-programmer-multi](https://www.desertcart.ro/products/60963783-horstmann-c21-programmer-multi)

---

*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-02-21*