Heat pump replacement using BUS scheme??

Mat3112

I'm pretty sure I was quoted for split system? Sorry it's all new for me. At the moment I have CTC ecoair 105. If that helps. And one of the quotes was for Worcester 5800l 5kw and 180l pre plumbed slim cylinder.

matelodave

Looking at the CTC ecoair 105 installation and operation documents it looks like a monobloc unit rated at around 5kw, so not a split system so its difficult to understand why you are being offered a split system to replace it.

As suggested above it shouldn't really cost silly money to replace it unless the system was poorly specified and badly installed. It should be reasonably easy just to couple up a new monobloc unit to the existing pipework and perhaps fiddle with some of the plumbing around the tank. 

A split system would require you to find space for the internal hydrobox unless its incorporated in with the cylinder which it doesn't appear to be with the Bosch unit you've been quoted.

What have others been suggesting or quoting you and have they been doing proper heat loss calculations to verify that your existing stuff is ok. Heatpumps that were installed when yours was fitted (like mine) were a bit of a black art and many were installed which didn't really do the job, and many of the installers fitted them like they were boilers,. Thats why they got a poor reputation for not keeping the place warm and costing the earth to run them.

Modern systems have better controls, are more efficient and have inverter driven compressors rather than single speed units (which is what the EcoAir 105 appears to have). Installers have more experience nowadays and the MCS system has been tightened significantly since then. Requiring proper heat loss and system design calculations rather the the basic rule of thumb of the era of your installation.

Have you got the MCS certificate from the original installation or any other documentation relating to the heating installation.

Mat3112

Thank you for your reply. I think I'm mixing the terms - quotes are for the same type of heat pump so monoblock. I don't have any papers for it unfortunately. I'm pretty sure our pump has two speed (fan low and high if that's what you mean) it's really confusing now when everyone here says we shouldn't really need changing so much. If that's any help that's photo of our cylinder