Heating / hotwater systems -self build

[cairstiona]

I am building a rectangular bungalow house, 3 bedroom, 125m2. 

 

Looking into different options for electric heating and hot water systems. Any advice appreciated. 

 

- Not going to use underfloor, 

- Not going to use ground source/ airsource heat pump. 

- Will be a very well insulated house, but not a passive house 

- will have a stove in the main area. 

- may install renewable in future - but not within budget at present. 

 

Looking particularly for advice on different in

dry electric heating system or wet electric system? with regards to good heating and hot water system. 

 

- I could have a dry system, for simplicity and just plug heaters into the wall. 

OR 

I could install a wet system and some sort of boiler for doing combination of hot water and heaters.

 

 

Thanks very much 

[SteamyTea]

Welcome

 

19 minutes ago, cairstiona said:

- Not going to use underfloor, 

- Not going to use ground source/ airsource heat pump. 

- Will be a very well insulated house, but not a passive house 

- will have a stove in the main area. 

- may install renewable in future - but not within budget at present. 

Seems an odd priority list to me, other may think differently.

 

19 minutes ago, cairstiona said:

dry electric heating system or wet electric system

If that is just resistance heating, then it could cost you 3 times more than running through a heat pump.

You can get Air to Air Heat Pumps for space heating and Exhaust Air Heat Pumps for water heating.  Those two could be an option.

 

 

As you don't want to fit an UFH system, what levels or floor insulation are you fitting?

 

Edited January 29 by SteamyTea

[JohnMo]

Storage heaters on E7 in main areas and panel heater in bedrooms?

E7 Cylinder.

 

But why?

I would do self install of a heat pump - and UFH and heat pump cylinder.  UFH on 200mm centres generally, 100mm centres in bathrooms, single zone, no buffer, flow direct from heat pump or electronic mixer. Overall could be cheaper to install and run. All out of sight.

 

4 to 6kW heat pump - £2k

Cylinder - £800

UFH manifold - £100

Pert-al-Pert pipe for UFH £400-500 with clips and unions

Another £500 for general stuff

All VAT free

 

Bungalows cost more to heat than houses as the form factor is rubbish, direct electric heating will cost huge amounts. Don't be fooled by advertising that is there to mislead.  Do the heat loss calculation, if your house looses 3kW, that's 72kWh per day or £20 per day or £600 per month, plus DHW heating. Even a poor install of the heat pump will give a CoP of 2.5 to 3, so now your monthly cost is £200.

[Iceverge]

Maximise your building fabric and it really doesn't matter how you heat the house.

 

What is your planned airtightness level?

What is the ventilation strategy?

What levels of insulation are you planning on?

 

We heat a 185m2 house with a single plug in radiator. About 3000kWh per year usage.

 

However it's costing about €900/year to heat so we're installing an A2A heat pump which should bring it down to about €200/year.

 

 

 

 

 

 

[Alan Ambrose]

>>> heat a 185m2 house with a single plug in radiator.

 

Does that heat circulate OK?

[Iceverge]

It's fine so long as you heat at steadily for long periods. 

 

If you put the rad in one room and close the door and turn it up then that room can get too hot.